W dniu 16.03.2021 o 15:35, tue...@freebsd.org pisze:
>> On 16. Mar 2021, at 15:18, Marek Zarychta <zarych...@plan-b.pwste.edu.pl>
>> wrote:
>>
>> W dniu 16.03.2021 o 12:50, tue...@freebsd.org pisze:
>>>> On 16. Mar 2021, at 11:55, Blake Hartshorn <cont...@blakehartshorn.com>
>>>> wrote:
>>>>
>>>> Hi Michael,
>>>>
>>>> I've attached tcpdumps for port 80 on both sides of a bad transfer, using
>>>> 2 VMs in the same datacenter, FreeBSD 13 serving and 12 as a client. A
>>>> friend of mine suggested I also run some tests with iperf3, so pasting
>>>> those results below. You'll see it going fast in one direction and
>>>> crawling in the other on TCP. There's also some disparity on UDP.
>>> The problem is that the server provides TCP segments larger than the MTU
>>> to the NIC. These are dropped and needs to be retransmitted. That is why
>>> it takes so long. So I guess TSO is enabled on the NIC and not working
>>> correctly.
>>>
>>> What is the output of ifconfig? Can you disable TSO? Does that work around
>>> the problem?
>>>
>>> Best regards
>>> Michael
>>>>
>>>> TCP:
>>>> [ ID][Role] Interval Transfer Bitrate Retr Cwnd
>>>> [ 5][TX-C] 0.00-1.00 sec 27.7 MBytes 233 Mbits/sec 342 26.7
>>>> KBytes
>>>> [ 7][RX-C] 0.00-1.00 sec 4.18 KBytes 34.3 Kbits/sec
>>>>
>>>> [ 5][TX-C] 1.00-2.00 sec 15.8 MBytes 132 Mbits/sec 249 52.0
>>>> KBytes
>>>> [ 7][RX-C] 1.00-2.00 sec 4.18 KBytes 34.3 Kbits/sec
>>>>
>>>> [ 5][TX-C] 2.00-3.00 sec 13.7 MBytes 115 Mbits/sec 307 15.4
>>>> KBytes
>>>> [ 7][RX-C] 2.00-3.00 sec 4.18 KBytes 34.3 Kbits/sec
>>>>
>>>> [ 5][TX-C] 3.00-4.00 sec 14.5 MBytes 121 Mbits/sec 260 22.4
>>>> KBytes
>>>> [ 7][RX-C] 3.00-4.00 sec 4.18 KBytes 34.3 Kbits/sec
>>>>
>>>> [ 5][TX-C] 4.00-5.00 sec 14.3 MBytes 120 Mbits/sec 240 37.9
>>>> KBytes
>>>> [ 7][RX-C] 4.00-5.00 sec 5.58 KBytes 45.7 Kbits/sec
>>>>
>>>> [ 5][TX-C] 5.00-6.00 sec 17.7 MBytes 149 Mbits/sec 363 15.4
>>>> KBytes
>>>> [ 7][RX-C] 5.00-6.00 sec 4.18 KBytes 34.3 Kbits/sec
>>>>
>>>> [ 5][TX-C] 6.00-7.00 sec 14.8 MBytes 124 Mbits/sec 287 8.38
>>>> KBytes
>>>> [ 7][RX-C] 6.00-7.00 sec 5.58 KBytes 45.7 Kbits/sec
>>>>
>>>> [ 5][TX-C] 7.00-8.00 sec 14.7 MBytes 123 Mbits/sec 293 28.1
>>>> KBytes
>>>> [ 7][RX-C] 7.00-8.00 sec 4.18 KBytes 34.3 Kbits/sec
>>>>
>>>> [ 5][TX-C] 8.00-9.00 sec 11.9 MBytes 100 Mbits/sec 325 18.3
>>>> KBytes
>>>> [ 7][RX-C] 8.00-9.00 sec 4.18 KBytes 34.3 Kbits/sec
>>>>
>>>> [ 5][TX-C] 9.00-10.00 sec 14.3 MBytes 120 Mbits/sec 315 39.3
>>>> KBytes
>>>> [ 7][RX-C] 9.00-10.00 sec 4.18 KBytes 34.3 Kbits/sec
>>>>
>>>> - - - - - - - - - - - - - - - - - - - - - - - - -
>>>> [ ID][Role] Interval Transfer Bitrate Retr
>>>> [ 5][TX-C] 0.00-10.00 sec 159 MBytes 134 Mbits/sec 2981
>>>> sender
>>>> [ 5][TX-C] 0.00-10.00 sec 159 MBytes 134 Mbits/sec
>>>> receiver
>>>> [ 7][RX-C] 0.00-10.00 sec 77.0 KBytes 63.1 Kbits/sec 65
>>>> sender
>>>> [ 7][RX-C] 0.00-10.00 sec 44.6 KBytes 36.6 Kbits/sec
>>>> receiver
>>>> -----------------------------------------------------------------------------------------------------------
>>>>
>>>>
>>>> UDP:
>>>> [ ID][Role] Interval Transfer Bitrate Jitter
>>>> Lost/Total Datagrams
>>>> [ 5][TX-C] 0.00-1.00 sec 81.6 MBytes 685 Mbits/sec
>>>> 67798
>>>> [ 7][RX-C] 0.00-1.00 sec 8.80 MBytes 73.8 Mbits/sec 0.255 ms
>>>> 54070/60475 (89%)
>>>> [ 5][TX-C] 1.00-2.00 sec 72.7 MBytes 610 Mbits/sec
>>>> 64802
>>>> [ 7][RX-C] 1.00-2.00 sec 8.52 MBytes 71.5 Mbits/sec 0.154 ms
>>>> 68912/75116 (92%)
>>>> [ 5][TX-C] 2.00-3.00 sec 73.7 MBytes 618 Mbits/sec
>>>> 64158
>>>> [ 7][RX-C] 2.00-3.00 sec 8.52 MBytes 71.5 Mbits/sec 0.276 ms
>>>> 67738/73945 (92%)
>>>> [ 5][TX-C] 3.00-4.00 sec 76.6 MBytes 643 Mbits/sec
>>>> 63521
>>>> [ 7][RX-C] 3.00-4.00 sec 8.55 MBytes 71.8 Mbits/sec 0.160 ms
>>>> 68647/74874 (92%)
>>>> [ 5][TX-C] 4.00-5.00 sec 76.1 MBytes 638 Mbits/sec
>>>> 64614
>>>> [ 7][RX-C] 4.00-5.00 sec 8.55 MBytes 71.7 Mbits/sec 0.461 ms
>>>> 67542/73767 (92%)
>>>> [ 5][TX-C] 5.00-6.00 sec 75.9 MBytes 637 Mbits/sec
>>>> 64834
>>>> [ 7][RX-C] 5.00-6.00 sec 8.57 MBytes 71.9 Mbits/sec 0.297 ms
>>>> 71565/77806 (92%)
>>>> [ 5][TX-C] 6.00-7.00 sec 73.0 MBytes 613 Mbits/sec
>>>> 63639
>>>> [ 7][RX-C] 6.00-7.00 sec 8.40 MBytes 70.5 Mbits/sec 0.199 ms
>>>> 69545/75663 (92%)
>>>> [ 5][TX-C] 7.00-8.00 sec 74.6 MBytes 626 Mbits/sec
>>>> 65030
>>>> [ 7][RX-C] 7.00-8.00 sec 8.78 MBytes 73.6 Mbits/sec 0.254 ms
>>>> 67173/73566 (91%)
>>>> [ 5][TX-C] 8.00-9.00 sec 75.0 MBytes 629 Mbits/sec
>>>> 64848
>>>> [ 7][RX-C] 8.00-9.00 sec 8.77 MBytes 73.5 Mbits/sec 0.298 ms
>>>> 70932/77315 (92%)
>>>> [ 5][TX-C] 9.00-10.00 sec 74.5 MBytes 625 Mbits/sec
>>>> 64487
>>>> [ 7][RX-C] 9.00-10.00 sec 8.71 MBytes 73.1 Mbits/sec 0.185 ms
>>>> 68268/74612 (91%)
>>>> - - - - - - - - - - - - - - - - - - - - - - - - -
>>>> [ ID][Role] Interval Transfer Bitrate Jitter
>>>> Lost/Total Datagrams
>>>> [ 5][TX-C] 0.00-10.00 sec 754 MBytes 632 Mbits/sec 0.000 ms
>>>> 0/647731 (0%) sender
>>>> [ 5][TX-C] 0.00-10.12 sec 105 MBytes 87.2 Mbits/sec 0.245 ms
>>>> 571090/647649 (88%) receiver
>>>> [ 7][RX-C] 0.00-10.00 sec 1009 MBytes 846 Mbits/sec 0.000 ms
>>>> 0/761013 (0%) sender
>>>> [ 7][RX-C] 0.00-10.12 sec 86.2 MBytes 71.4 Mbits/sec 0.185 ms
>>>> 674392/737139 (91%) receiver
>>>>
>>>>
>>
>> Taking a look at this iperf output I recalled that 80% of my setups
>> suffered from similar issue after transitioning from 1{1,2}-STABLE to
>> 13-STABLE about a mounth ago. I have asked on IRC but nobody confirmed
>> similar problems so I have reduced MTU to 8900 from the original 9000 on
>> some vlan(4) interfaces to solve the issue. I am using mostly vlan(4)s
>> over LACP lagg(4)s created on NICs. So far (for FreeBSD 11 and 12)
>> setting MTU 9000 on physical NIC was sufficient to make it work, now I
>> have set MTU 9000 on NICs and reduced MTU 8900 on vlan(4)s.
> TCP announces an MSS of 1440, which corresponds to an MTU of 1500 byte.
> So I guess your problem is different.
> Is your physical MTU 9000 bytes?
>
> Best regards
> MichaelYes, MTU for some VLANs in this network is 9000 bytes and I performed only software upgrades, hardware was untouched. I haven't had similar issues while running 11.4-STABLE or 12.2-STABLE. The aforementioned 8900 is not a critical value, but the reduction from an original 9000 was mandatory. With kind regards, Marek >>>> >>>> >>>> On Tuesday, March 16, 2021 4:16:15 AM EDT tue...@freebsd.org wrote: >>>>>> On 15. Mar 2021, at 12:56, Blake Hartshorn <cont...@blakehartshorn.com> >>>>>> wrote: >>>>>> >>>>>> The short version, when I use FreeBSD 13, delivering data can take 5 >>>>>> minutes for 1MB over SSH or HTTP when using IPv6. This problem does not >>>>>> happen with IPv4. I installed FreeBSD 12 and Linux on that same device, >>>>>> neither had the problem. >>>>>> >>>>>> Did some troubleshooting with Linode, have ultimately ruled the network >>>>>> itself out at this point. When the server is on FreeBSD 13, it can >>>>>> download quickly over IPv6, but not deliver. Started investigating after >>>>>> noticing my SSH session was lagging when cat'ing large files or running >>>>>> builds. This problem even occurs between VMs in the same datacenter. I >>>>>> generated a 1MB file of base64 garbage served by nginx for testing. IPv6 >>>>>> is being configured by SLAAC and on both 12 and 13 installs was setup by >>>>>> the installer. Linode uses Linux/KVM hosts for their virtual machines so >>>>>> it's running on that virtual adapter. >>>>>> >>>>>> I asked on the forums, another user recommended going to the mailing >>>>>> lists instead. Does anyone know if config settings need to be different >>>>>> on 13? Did I maybe just find a real issue? I can provide any requested >>>>>> details. Thanks! >>>>> Could you prove a .pcap tracefile, one from the sender, one from the >>>>> recevier, of >>>>> a TCP/IPv6 connection, which doesn't work as expected. For example, use >>>>> your 1MB >>>>> base64 garbage transfer. >>>>> >>>>> Best regardes >>>>> Michael >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> freebsd-net@freebsd.org mailing list >>>>>> https://lists.freebsd.org/mailman/listinfo/freebsd-net >>>>>> To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org" >>>>> >>>>> >>>> <freebsd12-client.pcap.gz><freebsd13-server.pcap.gz> >>> >>> _______________________________________________ >>> freebsd-net@freebsd.org mailing list >>> https://lists.freebsd.org/mailman/listinfo/freebsd-net >>> To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org" >>> >> >> >> -- >> Marek Zarychta >> > > -- Marek Zarychta
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