On Sun, Mar 31, 2019 at 12:15 PM Lorenzo Bianconi
<lorenzo.bianc...@redhat.com> wrote:
>
> >
> > On Sun, Mar 31, 2019 at 6:45 AM Lorenzo Bianconi
> > <lorenzo.bianc...@redhat.com> wrote:
> > >
> > > >
> > > > bump.
> > >
> > > Hi Joe,
> > >
> > > sorry for the delay
> > >
> > > >
> > > > On Mon, Mar 18, 2019 at 10:59 PM Joe Ayers <j...@ayerscasa.com> wrote:
> > > >>
> > > >> Lorenzo, I have tested dynack on a (real distance apart) ~60km link
> > > >> with some success. This is the code change made:
> > > >>
> > > >> --- a/drivers/net/wireless/ath/ath9k/dynack.c
> > > >> +++ b/drivers/net/wireless/ath/ath9k/dynack.c
> > > >> @@ -20,8 +20,9 @@
> > > >>
> > > >> #define COMPUTE_TO (5 * HZ)
> > > >> #define LATEACK_DELAY (10 * HZ)
> > > >> -#define LATEACK_TO 256
> > > >> -#define MAX_DELAY 300
> > > >> +#define LATEACK_TO 1054
> > > >> +/* AREDN max distance set to 150km */
> > > >> +#define MAX_DELAY 1054
> > > >> #define EWMA_LEVEL 96
> > > >> #define EWMA_DIV 128
> > > >>
> > > >> @@ -293,7 +294,8 @@
> > > >> void ath_dynack_node_init(struct ath_hw *ah, struct ath_node *an)
> > > >> {
> > > >> /* ackto = slottime + sifs + air delay */
> > > >> - u32 ackto = 9 + 16 + 64;
> > > >> + /* AREDN starting point is 20km */
> > > >> + u32 ackto = 9 + 16 + 171;
> > > >> struct ath_dynack *da = &ah->dynack;
> > > >>
> > > >> an->ackto = ackto;
> > > >> @@ -328,7 +330,8 @@
> > > >> void ath_dynack_reset(struct ath_hw *ah)
> > > >> {
> > > >> /* ackto = slottime + sifs + air delay */
> > > >> - u32 ackto = 9 + 16 + 64;
> > > >> + /* AREDN starting point is 20km */
> > > >> + u32 ackto = 9 + 16 + 171;
> > > >> struct ath_dynack *da = &ah->dynack;
> > > >>
> > > >> da->lto = jiffies;
> > > >>
> > > >> Notes:
> > > >>
> > > >> 1) The stations are showing ack_to between 525 up to 575 A. When
> > > >> static set at 60k distance, the timeout is set to 460 S.
> > > >> 2) significant performance improvement between these settings with
> > > >> iperf3 and back to back runs with reboot in the middle:
> > > >>
> > >
> > > could you please try to attached patch? The max distance the hw can
> > > support depends of channel width:
> > > e.g @20MHz (HT20, 5GHz)
> > >
> > > max distance is ~ 61Km
> > >
> >
> > Could these max distance specs be what the manufacture tested, not
> > necessarily a hardware limitation -- just not known?
> >
>
> https://github.com/torvalds/linux/blob/master/drivers/net/wireless/ath/ath9k/hw.c#L1006
>
> max timeout you can set is AR_TIME_OUT_ACK (0x3fff) / clock_rate
>
> > I suspect in the calculation for max_to, if the channel is 10MHz, the
> > max distance can be doubled for the hardware--do the specs only give
> > 20MHz values? This would be consistent with, for example, the symbol
> > lengths are doubled when cutting the bandwidth in half, hence half the
> > rates and still 64 bins or 64 point fft squeezed in the channel. SNR
> > is also 3dB higher given same energy in half the bandwidth. We don't
> > see 20MHz channels working at these long distances, rather use 10MHz
> > for it to work. Intuitively, as I understand it, more time is needed
> > with increased distance for reflection signals to not be received past
> > the symbol time and increased inter-symbol interference.
>
> yes, but it is already done in ath9k_hw_set_clockrate()
> https://github.com/torvalds/linux/blob/master/drivers/net/wireless/ath/ath9k/hw.c#L61
>
> >
> > > @Koen: do you have any chance to test the attached patch in your
> > > environment? Thx
> > >
> > > >> run 1 @ static 60km:
> > > >> [ 5] 0.00-10.00 sec 7.31 MBytes 6.13 Mbits/sec 0
> > > >> sender
> > > >> [ 5] 0.00-10.08 sec 7.16 MBytes 5.95 Mbits/sec
> > > >> receiver
> > > >>
> > > >> run 2 @ static 60km:
> > > >> [ 5] 0.00-10.00 sec 5.88 MBytes 4.93 Mbits/sec 0
> > > >> sender
> > > >> [ 5] 0.00-10.04 sec 5.77 MBytes 4.81 Mbits/sec
> > > >> receiver
> > > >>
> > > >> run 1 and 2 @ auto distance -- goes up to ~575us with data flow,
> > > >> floats back to ~525 otherwise:
> > > >> [ 5] 0.00-10.00 sec 20.0 MBytes 16.8 Mbits/sec 0
> > > >> sender
> > > >> [ 5] 0.00-10.07 sec 19.8 MBytes 16.5 Mbits/sec
> > > >> receiver
> > > >>
> > > >> [ 5] 0.00-10.00 sec 21.4 MBytes 18.0 Mbits/sec 0
> > > >> sender
> > > >> [ 5] 0.00-10.04 sec 21.2 MBytes 17.7 Mbits/sec
> > > >> receiver
> > > >>
> > > >> 3) running wpa_supplicant and psk2
> > > >> 4) running ibss on ch 176 with AREDN channels on top of 18.06.2
> > > >> 5) on one reboot, one of the stations stayed down at initial 196, then
> > > >> bumped up to ~250 range and stayed there, link not functional. Not
> > > >> sure how to explain this value...
> > > >>
> > > >> Question, can this condition be true periodically while the link is
> > > >> live or only at initial 802.11 adhoc link setup?:
> > > >>
> > > >> if (ieee80211_is_assoc_req(hdr->frame_control) ||
> > > >> ieee80211_is_assoc_resp(hdr->frame_control) ||
> > > >> ieee80211_is_auth(hdr->frame_control)) {
> > > >>
> > >
> > > I do not think so since AFAIK auth frames are sent just during ibss join
> > >
> > > >> 6) Auto distance stayed at initial 196 when turning off encryption.
> > > >>
> > > >> Any ideas of alternative options of packets to key off in late ack
> > > >> situation? running wpad-mini is ~500k file size and RAM consumer.
> > > >> It would be beneficial to take wpa_supplicant out of the equation if
> > > >> at all possible.
> > > >>
> > >
> > > What is mandatory are unicast frames during joining phase, maybe you can
> > > develop an userspace daemon for this purpose
> > >
> >
> > I see where you're going with this. I'd have to learn a lot to do
> > this. Possibly a simpler approach, if it doesn't add too much
> > penalty. What if the initial ack_to is at max, it quickly settles
> > down to measured, then after some criteria, time or # acks received,
> > say ~15 seconds has elapsed a cycle is triggered back to max ack_to.
> > This should catch new stations joining at farther distances when wpad
> > is not used.
> >
>
> I am a little bit concerned about short/medium distance links with high LER.
> Is the attached patch working?
>
> Regards,
> Lorenzo
>
I did not have success on the patch on 60km link @ 10MHz channel with
encryption. I need to double-check, tomorrow, to have confidence
something wasn't overlooked. After I turned on debug, here's what
the log looked like, ack_to stayed too short (from memory) "89 A".
[ 29.956353] br-lan: port 1(eth0) entered blocking state
[ 29.961669] br-lan: port 1(eth0) entered forwarding state
[ 29.968128] ttyS ttyS0: 1 input overrun(s)
[ 40.115424] wlan0: Trigger new scan to find an IBSS to join
[ 197.402125] ath: phy0: rx sample 160615364 [h 12-t 15]
[ 198.828057] ath: phy0: rx sample 162041305 [h 12-t 16]
[ 199.355304] ath: phy0: {44:d9:e7:c0:15:4d} tx sample 162568408 [dur
80][h 17-t 18]
[ 199.355358] ath: phy0: ack_ts 159069666 st_ts 162568408 st_dur 80 [12-17]
[ 199.355373] ath: phy0: ack_ts 159070847 st_ts 162568408 st_dur 80 [13-17]
[ 199.355388] ath: phy0: ack_ts 160615364 st_ts 162568408 st_dur 80 [14-17]
[ 199.355403] ath: phy0: ack_ts 162041305 st_ts 162568408 st_dur 80 [15-17]
[ 199.392299] ath: phy0: rx sample 162605530 [h 16-t 17]
[ 199.392342] ath: phy0: ack_ts 162605530 st_ts 162568408 st_dur 80 [16-17]
[ 199.674044] ath: phy0: rx sample 162887287 [h 16-t 18]
[ 200.234878] ath: phy0: rx sample 163448139 [h 16-t 19]
[ 200.633696] ath: phy0: rx sample 163846942 [h 16-t 20]
[ 201.206719] ath: phy0: rx sample 164419968 [h 16-t 21]
[ 201.890843] ath: phy0: rx sample 165104085 [h 16-t 22]
[ 206.104859] ath: phy0: {44:d9:e7:c0:15:4d} tx sample 169318008 [dur
80][h 18-t 19]
[ 206.104884] ath: phy0: ack_ts 162605530 st_ts 169318008 st_dur 80 [16-18]
[ 206.104900] ath: phy0: ack_ts 162887287 st_ts 169318008 st_dur 80 [17-18]
[ 206.104915] ath: phy0: ack_ts 163448139 st_ts 169318008 st_dur 80 [18-18]
[ 206.104930] ath: phy0: ack_ts 163846942 st_ts 169318008 st_dur 80 [19-18]
[ 206.104945] ath: phy0: ack_ts 164419968 st_ts 169318008 st_dur 80 [20-18]
[ 206.104959] ath: phy0: ack_ts 165104085 st_ts 169318008 st_dur 80 [21-18]
[ 207.735339] ath: phy0: rx sample 170948588 [h 22-t 23]
[ 207.735363] ath: phy0: ack_ts 170948588 st_ts 169318008 st_dur 80 [22-18]
[ 212.135832] ath: phy0: rx sample 175349078 [h 22-t 24]
[ 212.646658] ath: phy0: {44:d9:e7:c0:15:4d} tx sample 175858835 [dur
3180][h 19-t 20]
[ 212.646682] ath: phy0: ack_ts 170948588 st_ts 175858835 st_dur 3180 [22-19]
[ 212.646715] ath: phy0: ack_ts 175349078 st_ts 175858835 st_dur 3180 [23-19]
[ 212.655967] ath: phy0: rx sample 175869229 [h 24-t 25]
[ 212.655991] ath: phy0: ack_ts 175869229 st_ts 175858835 st_dur 3180 [24-19]
[ 213.463873] ath: phy0: rx sample 176677247 [h 24-t 26]
[ 214.011744] ath: phy0: rx sample 177225005 [h 24-t 27]
[ 214.695804] ath: phy0: rx sample 177909064 [h 24-t 28]
[ 215.302377] ath: phy0: {44:d9:e7:c0:15:4d} tx sample 178515072 [dur
2804][h 20-t 21]
[ 215.302402] ath: phy0: ack_ts 175869229 st_ts 178515072 st_dur 2804 [24-20]
[ 215.302417] ath: phy0: ack_ts 176677247 st_ts 178515072 st_dur 2804 [25-20]
[ 215.302432] ath: phy0: ack_ts 177225005 st_ts 178515072 st_dur 2804 [26-20]
[ 215.302447] ath: phy0: ack_ts 177909064 st_ts 178515072 st_dur 2804 [27-20]
[ 215.441735] ath: phy0: rx sample 178654966 [h 28-t 29]
[ 215.441760] ath: phy0: ack_ts 178654966 st_ts 178515072 st_dur 2804 [28-20]
[ 215.915237] ath: phy0: rx sample 179128515 [h 28-t 30]
[ 215.964754] ath: phy0: rx sample 179178017 [h 28-t 31]
[ 215.966648] ath: phy0: rx sample 179179951 [h 28-t 32]
[ 216.593609] ath: phy0: rx sample 179806871 [h 28-t 33]
[ 216.692988] ath: phy0: rx sample 179906248 [h 28-t 34]
[ 216.696747] ath: phy0: rx sample 179910028 [h 28-t 35]
[ 217.143315] ath: phy0: rx sample 180356569 [h 28-t 36]
[ 217.243497] ath: phy0: rx sample 180456764 [h 28-t 37]
[ 217.740801] ath: phy0: rx sample 180954068 [h 28-t 38]
[ 217.742587] ath: phy0: rx sample 180955845 [h 28-t 39]
[ 217.771823] ath: phy0: rx sample 180985091 [h 28-t 40]
[ 217.774091] ath: phy0: rx sample 180987376 [h 28-t 41]
[ 218.143797] ath: phy0: rx sample 181356153 [h 28-t 42]
[ 218.145709] ath: phy0: rx sample 181358955 [h 28-t 43]
[ 218.487477] ath: phy0: rx sample 181700756 [h 28-t 44]
[ 218.823813] ath: phy0: rx sample 182037099 [h 28-t 45]
[ 218.824925] ath: phy0: rx sample 182038231 [h 28-t 46]
[ 219.248108] ath: phy0: rx sample 182461382 [h 28-t 47]
[ 219.249844] ath: phy0: rx sample 182463153 [h 28-t 48]
[ 219.526230] ath: phy0: rx sample 182739468 [h 28-t 49]
[ 219.529144] ath: phy0: rx sample 182742408 [h 28-t 50]
[ 219.837333] ath: phy0: rx sample 183050622 [h 28-t 51]
[ 219.855530] ath: phy0: rx sample 183068800 [h 28-t 52]
[ 219.957283] ath: phy0: rx sample 183170560 [h 28-t 53]
[ 219.958754] ath: phy0: rx sample 183172062 [h 28-t 54]
[ 220.536767] ath: phy0: {44:d9:e7:c0:15:4d} tx sample 183748234 [dur
168][h 21-t 22]
[ 220.536791] ath: phy0: ack_ts 178654966 st_ts 183748234 st_dur 168 [28-21]
[ 220.536807] ath: phy0: ack_ts 179128515 st_ts 183748234 st_dur 168 [29-21]
[ 220.536822] ath: phy0: ack_ts 179178017 st_ts 183748234 st_dur 168 [30-21]
[ 220.536837] ath: phy0: ack_ts 179179951 st_ts 183748234 st_dur 168 [31-21]
[ 220.536852] ath: phy0: ack_ts 179806871 st_ts 183748234 st_dur 168 [32-21]
[ 220.536867] ath: phy0: ack_ts 179906248 st_ts 183748234 st_dur 168 [33-21]
[ 220.536882] ath: phy0: ack_ts 179910028 st_ts 183748234 st_dur 168 [34-21]
[ 220.536897] ath: phy0: ack_ts 180356569 st_ts 183748234 st_dur 168 [35-21]
[ 220.536912] ath: phy0: ack_ts 180456764 st_ts 183748234 st_dur 168 [36-21]
[ 220.536927] ath: phy0: ack_ts 180954068 st_ts 183748234 st_dur 168 [37-21]
[ 220.536942] ath: phy0: ack_ts 180955845 st_ts 183748234 st_dur 168 [38-21]
[ 220.536957] ath: phy0: ack_ts 180985091 st_ts 183748234 st_dur 168 [39-21]
[ 220.536972] ath: phy0: ack_ts 180987376 st_ts 183748234 st_dur 168 [40-21]
[ 220.536987] ath: phy0: ack_ts 181356153 st_ts 183748234 st_dur 168 [41-21]
[ 220.537002] ath: phy0: ack_ts 181358955 st_ts 183748234 st_dur 168 [42-21]
[ 220.537017] ath: phy0: ack_ts 181700756 st_ts 183748234 st_dur 168 [43-21]
[ 220.537032] ath: phy0: ack_ts 182037099 st_ts 183748234 st_dur 168 [44-21]
[ 220.537047] ath: phy0: ack_ts 182038231 st_ts 183748234 st_dur 168 [45-21]
[ 220.537062] ath: phy0: ack_ts 182461382 st_ts 183748234 st_dur 168 [46-21]
[ 220.537077] ath: phy0: ack_ts 182463153 st_ts 183748234 st_dur 168 [47-21]
[ 220.537092] ath: phy0: ack_ts 182739468 st_ts 183748234 st_dur 168 [48-21]
[ 220.537107] ath: phy0: ack_ts 182742408 st_ts 183748234 st_dur 168 [49-21]
[ 220.537140] ath: phy0: ack_ts 183050622 st_ts 183748234 st_dur 168 [50-21]
[ 220.537155] ath: phy0: ack_ts 183068800 st_ts 183748234 st_dur 168 [51-21]
[ 220.537170] ath: phy0: ack_ts 183170560 st_ts 183748234 st_dur 168 [52-21]
[ 220.537185] ath: phy0: ack_ts 183172062 st_ts 183748234 st_dur 168 [53-21]
[ 221.407198] ath: phy0: rx sample 184620468 [h 54-t 55]
[ 221.407223] ath: phy0: ack_ts 184620468 st_ts 183748234 st_dur 168 [54-21]
[ 221.862947] ath: phy0: rx sample 185076217 [h 54-t 56]
[ 221.866719] ath: phy0: rx sample 185080022 [h 54-t 57]
[ 223.105324] ath: phy0: rx sample 186318570 [h 54-t 58]
[ 223.903678] ath: phy0: rx sample 187116952 [h 54-t 59]
[ 223.907580] ath: phy0: rx sample 187120841 [h 54-t 60]
[ 224.255119] ath: phy0: rx sample 187468402 [h 54-t 61]
[ 224.675136] ath: phy0: rx sample 187888416 [h 54-t 62]
[ 225.827935] ath: phy0: rx sample 189041215 [h 54-t 63]
[ 225.830059] ath: phy0: rx sample 189043360 [h 54-t 0]
[ 226.122152] ath: phy0: rx sample 189335428 [h 54-t 1]
[ 226.124548] ath: phy0: rx sample 189337865 [h 54-t 2]
[ 226.556117] ath: phy0: rx sample 189769395 [h 54-t 3]
[ 226.559177] ath: phy0: rx sample 189772475 [h 54-t 4]
[ 226.676979] ath: phy0: {44:d9:e7:c0:15:4d} tx sample 189889636 [dur
288][h 22-t 23]
[ 226.677004] ath: phy0: ack_ts 184620468 st_ts 189889636 st_dur 288 [54-22]
[ 226.677019] ath: phy0: ack_ts 185076217 st_ts 189889636 st_dur 288 [55-22]
[ 226.677034] ath: phy0: ack_ts 185080022 st_ts 189889636 st_dur 288 [56-22]
[ 226.677049] ath: phy0: ack_ts 186318570 st_ts 189889636 st_dur 288 [57-22]
[ 226.677064] ath: phy0: ack_ts 187116952 st_ts 189889636 st_dur 288 [58-22]
[ 226.677079] ath: phy0: ack_ts 187120841 st_ts 189889636 st_dur 288 [59-22]
[ 226.677094] ath: phy0: ack_ts 187468402 st_ts 189889636 st_dur 288 [60-22]
[ 226.677109] ath: phy0: ack_ts 187888416 st_ts 189889636 st_dur 288 [61-22]
[ 226.677148] ath: phy0: ack_ts 189041215 st_ts 189889636 st_dur 288 [62-22]
[ 226.677163] ath: phy0: ack_ts 189043360 st_ts 189889636 st_dur 288 [63-22]
[ 226.677178] ath: phy0: ack_ts 189335428 st_ts 189889636 st_dur 288 [0-22]
[ 226.677193] ath: phy0: ack_ts 189337865 st_ts 189889636 st_dur 288 [1-22]
[ 226.677208] ath: phy0: ack_ts 189769395 st_ts 189889636 st_dur 288 [2-22]
[ 226.677223] ath: phy0: ack_ts 189772475 st_ts 189889636 st_dur 288 [3-22]
[ 226.940734] ath: phy0: {44:d9:e7:c0:15:4d} tx sample 190149825 [dur
3552][h 22-t 24]
[ 227.145354] ath: phy0: rx sample 190358638 [h 4-t 5]
[ 227.145379] ath: phy0: ack_ts 190358638 st_ts 189889636 st_dur 288 [4-22]
[ 227.145395] ath: phy0: ack_ts 190358638 st_ts 190149825 st_dur 3552 [4-23]
[ 227.585946] ath: phy0: rx sample 190799199 [h 4-t 6]
[ 227.721988] ath: phy0: {44:d9:e7:c0:15:4d} tx sample 190935148 [dur
80][h 24-t 25]
[ 227.722012] ath: phy0: ack_ts 190358638 st_ts 190935148 st_dur 80 [4-24]
[ 227.722028] ath: phy0: ack_ts 190799199 st_ts 190935148 st_dur 80 [5-24]
[ 228.120727] ath: phy0: rx sample 191334011 [h 6-t 7]
[ 228.120752] ath: phy0: ack_ts 191334011 st_ts 190935148 st_dur 80 [6-24]
[ 228.124955] ath: phy0: rx sample 191338272 [h 6-t 8]
[ 228.315928] ath: phy0: rx sample 191529228 [h 6-t 9]
[ 228.317513] ath: phy0: rx sample 191530821 [h 6-t 10]
[ 228.440364] ath: phy0: rx sample 191653645 [h 6-t 11]
[ 228.577569] ath: phy0: rx sample 191790833 [h 6-t 12]
[ 228.581457] ath: phy0: rx sample 191794722 [h 6-t 13]
[ 228.658327] ath: phy0: rx sample 191871617 [h 6-t 14]
[ 228.900168] ath: phy0: rx sample 192113449 [h 6-t 15]
[ 228.904672] ath: phy0: rx sample 192117995 [h 6-t 16]
[ 229.228065] ath: phy0: rx sample 192441368 [h 6-t 17]
[ 229.516237] ath: phy0: rx sample 192729521 [h 6-t 18]
[ 229.519803] ath: phy0: rx sample 192733097 [h 6-t 19]
[ 229.659565] ath: phy0: rx sample 192872836 [h 6-t 20]
[ 230.039245] ath: phy0: rx sample 193252548 [h 6-t 21]
[ 230.653931] ath: phy0: rx sample 193867225 [h 6-t 22]
[ 230.738556] ath: phy0: rx sample 193951843 [h 6-t 23]
[ 230.740006] ath: phy0: rx sample 193953248 [h 6-t 24]
[ 230.956872] ath: phy0: rx sample 194170164 [h 6-t 25]
[ 230.959536] ath: phy0: rx sample 194172861 [h 6-t 26]
[ 231.181837] ath: phy0: rx sample 194395127 [h 6-t 27]
[ 231.184747] ath: phy0: rx sample 194398071 [h 6-t 28]
[ 231.776087] ath: phy0: rx sample 194989330 [h 6-t 29]
[ 231.778612] ath: phy0: rx sample 194991863 [h 6-t 30]
[ 232.275938] ath: phy0: rx sample 195489244 [h 6-t 31]
[ 232.278229] ath: phy0: rx sample 195491557 [h 6-t 32]
[ 232.556163] ath: phy0: rx sample 195769445 [h 6-t 33]
[ 232.558751] ath: phy0: rx sample 195772046 [h 6-t 34]
[ 232.575733] ath: phy0: rx sample 195789026 [h 6-t 35]
[ 232.696912] ath: phy0: rx sample 195910205 [h 6-t 36]
[ 232.808461] ath: phy0: rx sample 196021764 [h 6-t 37]
[ 233.302605] ath: phy0: rx sample 196515876 [h 6-t 38]
[ 233.307306] ath: phy0: rx sample 196520597 [h 6-t 39]
[ 233.364771] ath: phy0: rx sample 196578031 [h 6-t 40]
[ 233.366169] ath: phy0: rx sample 196579440 [h 6-t 41]
[ 233.386912] ath: phy0: rx sample 196600181 [h 6-t 42]
[ 234.653791] ath: phy0: rx sample 197867078 [h 6-t 43]
[ 234.655365] ath: phy0: rx sample 197868668 [h 6-t 44]
[ 235.437288] ath: phy0: rx sample 198650587 [h 6-t 45]
[ 235.440085] ath: phy0: rx sample 198653377 [h 6-t 46]
[ 236.588956] ath: phy0: rx sample 199802250 [h 6-t 47]
[ 236.591932] ath: phy0: rx sample 199805223 [h 6-t 48]
[ 237.733586] ath: phy0: {44:d9:e7:c0:15:4d} tx sample 200946761 [dur
80][h 25-t 26]
[ 237.733633] ath: phy0: ack_ts 191334011 st_ts 200946761 st_dur 80 [6-25]
[ 237.733648] ath: phy0: ack_ts 191338272 st_ts 200946761 st_dur 80 [7-25]
...
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