Re: Multicast routing questions

[Andrey V. Elsukov]

On 24.06.2015 18:13, Emeric POUPON wrote:
> Hi,
> 
> Actually, I don't really understand why imo.imo_multicast_loop is set
> to 1 in send_packet, ip_mroute.c
> 
> It seems we don't need to loop the packet once it is mrouted? 

I think this can be used for the case, when on the router some app has
been joined to multicast group on the specific interface used as
outgoing in send_packet.

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NFS on 10G interface terribly slow

[Gerrit Kühn]

Hi all,

We have a recent FreeBSD 10.1 installation here that is supposed to act as
nfs (v3) client to an Oracle x4-2l server running Soalris 11.2.
We have Intel 10-Gigabit X540-AT2 NICs on both ends, iperf is showing
plenty of bandwidth (9.xGB/s) in both directions.
However, nfs appears to be terribly slow, especially for writing:

root@crest:~ # dd if=/dev/zero of=/net/hellpool/Z bs=1024k count=1000
1000+0 records in
1000+0 records out
1048576000 bytes transferred in 20.263190 secs (51747824 bytes/sec)


Reading appears to be faster, but still far away from full bandwidth:

root@crest:~ # dd of=/dev/null if=/net/hellpool/Z bs=1024k 
1000+0 records in
1000+0 records out
1048576000 bytes transferred in 5.129869 secs (204406000 bytes/sec)


We have already tried to tune rsize/wsize parameters, but they appear to
have little (if any) impact on these results. Also, neither stripping down
rxsum, txsum, tso etc. from the interface nor increasing MTU to 9000 for
jumbo frames did improve anything.
It is quite embarrassing to achieve way less than 1GBE performance with
10GBE equipment. Are there any hints what else might be causing this (and
how to fix it)?


cu
  Gerrit
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[Bug 153816] [ixgbe] ixgbe doesn't work properly with the Intel 10gigabit CX4 Dual Port network card

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[Bug 150249] [ixgbe] Media type detection broken

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[Bug 153936] [ixgbe] [patch] MPRC workaround incorrectly applied to 82599

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[Bug 195924] [patch] IXGBE watchdog bug causes crash.

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[Bug 200221] em0 watchdog timeout under load

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[Bug 194344] [regression] Wake on LAN no longer works on em(4)

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[Bug 183920] [ixgbe] [patch] Incorrect ifconfig media on INTEL X520-T2 10G Dual-port Ethernet Server Adapter, RJ45/2

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Re: Multicast routing questions

[Emeric POUPON]

Ok thanks, I understand this case.
But the problem is that we perform a lot of unnecessary mforward calls from 
ip_input.

The mrt route cache lookup is performed thanks to the src/dst addresse couple.
The interface of the cached route does not match the current interface and that 
is what prevents "infinite" loops.

Is that really how it is meant to be done?

Emeric

- Mail original -
De: "Andrey V. Elsukov" 
À: "Emeric POUPON" , freebsd-net@freebsd.org
Envoyé: Jeudi 25 Juin 2015 07:48:44
Objet: Re: Multicast routing questions

On 24.06.2015 18:13, Emeric POUPON wrote:
> Hi,
> 
> Actually, I don't really understand why imo.imo_multicast_loop is set
> to 1 in send_packet, ip_mroute.c
> 
> It seems we don't need to loop the packet once it is mrouted? 

I think this can be used for the case, when on the router some app has
been joined to multicast group on the specific interface used as
outgoing in send_packet.

-- 
WBR, Andrey V. Elsukov
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[Bug 162153] [em] intel em driver 7.2.4 don't compile

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[Bug 185427] [igb] [panic] freebsd 8.4, 9.1 and 9.2 panic Double-Fault with intel 82576 igb driver

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[Bug 197790] Intel em driver - random outgoing traffic sent through wrong interface

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[Bug 160750] Intel PRO/1000 connection breaks under load until reboot

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[Bug 150251] [patch] [ixgbe] Late cable insertion broken

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[Bug 189531] [fxp] Wake on Lan (WOL) enabled for Intel 82562EZ ethernet adapter, but WOL does not work

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[Bug 173201] [ixgbe] [patch] Missing / broken ixgbe sysctl's and tunables (patch included)

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[Bug 162028] [ixgbe] [patch] misplaced #endif in ixgbe.c

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[Bug 150920] [ixgbe][igb] Panic when packets are dropped with header split disabled

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[Bug 172895] [ixgb] [ixgbe] do not properly determine link-state

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[Bug 179824] [ixgbe] System (9.1-p4) hangs on heavy ixgbe network traffic with hw.ixgbe.num_queues=6

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[Bug 168440] [ixgbe] [patch] ixgbe flow control tunable regression

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[Bug 178782] [ixgbe] 82599EB SFP does not work with passthrough under KVM.

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[Bug 193673] [ixgbe] flowid / rss field should only be set if the packettype field says it has a flowid

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[Bug 191384] [ixgbe] ixgbe driver failed to identify PCI-Express slot bandwidth on 10-STABLE and 9.3-RC1, 10.0-RELEASE is partialy affected

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[Bug 170267] [ixgbe] IXGBE_LE32_TO_CPUS is probably an unintentional no-op

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[Bug 173137] [em] em(4) unable to run at gigabit with 9.1-RC2

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[Bug 152853] [em] tftpd (and likely other udp traffic) fails over em(4) unless rxcsum/txcsum disabled [regression]

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[Bug 168414] [ixgbe] [patch] ixgbe commit r234137 introduces code/comment mismatch

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[Bug 153244] [em] em(4) fails to send UDP to port 0xffff

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[Bug 168246] [em] Multiple em(4) not working with qemu

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[Bug 193053] ixgbe(4) IXGBE_LEGACY_TX + ALTQ path broken

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[Bug 193802] tso seems broken on RELENG10 for version 7.4.2 of em driver

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[Bug 199174] em tx and rx hang

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[Bug 142518] [em] [lagg] Problem on 8.0-STABLE with em and lagg

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[Bug 152828] [em] poor performance on 8.1, 8.2-PRE

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[Bug 161277] [em] [patch] BMC cannot receive IPMI traffic after loading or enabling the if_em driver

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[Bug 153308] [em] em interface use 100% cpu

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[Bug 164495] [igb] connect double head igb to switch cause system to halt

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[Bug 160693] [gif] [em] Multicast packet are not passed from GIF0 to EM0 interface (Packet Lost)

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[Bug 187068] [em] network data slow/stops with em driver

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[Bug 159294] [em] em watchdog timeouts

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[Bug 167500] [em] [panic] Kernel panics in em driver

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[Bug 155680] [multicast] problems with multicast

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[Bug 189234] [em] Big lag with Ethernet Connection I217-V

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[Bug 183271] [em] statistic not updated on em in netmap mode

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[Bug 175734] no ethernet detected on system with EG20T PCH chipset ATOM E6xx series

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[Bug 183381] [em] [patch] Use of 9k buffers in if_em.c hangs with resource starvation

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[Bug 193620] Problem with igb multiqueue together with pf

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[Bug 195078] em tx_dma_fails and dropped packets

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Re: Multicast routing questions

[Andrey V. Elsukov]

On 25.06.2015 19:18, Emeric POUPON wrote:
> Ok thanks, I understand this case.
> But the problem is that we perform a lot of unnecessary mforward calls from 
> ip_input.
> 
> The mrt route cache lookup is performed thanks to the src/dst addresse couple.
> The interface of the cached route does not match the current interface and 
> that is what prevents "infinite" loops.
> 
> Is that really how it is meant to be done?

I'm agree it isn't optimal. Do you have some patches that improves this?
It looks like freebsd is used very rare as multicast router. So, if you
break something, this will not be found soon.

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Re: NFS on 10G interface terribly slow

[Scott Larson]

 We've got 10.0 and 10.1 servers accessing Isilon and Nexenta via NFS
with Intel 10G gear and bursting to near wire speed with the stock
MTU/rsize/wsize works as expected. TSO definitely needs to be enabled for
that performance. The fact iperf gives you the expected throughput but NFS
does not would have me looking at tuning for the NFS platform. Other things
to look at: Are all the servers involved negotiating the correct speed and
duplex, with TSO? Does it need to have the network stack tuned with
whatever it's equivalent of maxsockbuf and send/recvbuf are? Do the switch
ports and NIC counters show any drops or errors? On the FBSD servers you
could also run 'netstat -i -w 1' under load to see if drops are occurring
locally, or 'systat -vmstat' for resource contention problems. But again, a
similar setup here and no such issues have appeared.


*[image: userimage]Scott Larson[image: los angeles]
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On Thu, Jun 25, 2015 at 5:52 AM, Gerrit Kühn 
wrote:

> Hi all,
>
> We have a recent FreeBSD 10.1 installation here that is supposed to act as
> nfs (v3) client to an Oracle x4-2l server running Soalris 11.2.
> We have Intel 10-Gigabit X540-AT2 NICs on both ends, iperf is showing
> plenty of bandwidth (9.xGB/s) in both directions.
> However, nfs appears to be terribly slow, especially for writing:
>
> root@crest:~ # dd if=/dev/zero of=/net/hellpool/Z bs=1024k count=1000
> 1000+0 records in
> 1000+0 records out
> 1048576000 bytes transferred in 20.263190 secs (51747824 bytes/sec)
>
>
> Reading appears to be faster, but still far away from full bandwidth:
>
> root@crest:~ # dd of=/dev/null if=/net/hellpool/Z bs=1024k
> 1000+0 records in
> 1000+0 records out
> 1048576000 bytes transferred in 5.129869 secs (204406000 bytes/sec)
>
>
> We have already tried to tune rsize/wsize parameters, but they appear to
> have little (if any) impact on these results. Also, neither stripping down
> rxsum, txsum, tso etc. from the interface nor increasing MTU to 9000 for
> jumbo frames did improve anything.
> It is quite embarrassing to achieve way less than 1GBE performance with
> 10GBE equipment. Are there any hints what else might be causing this (and
> how to fix it)?
>
>
> cu
>   Gerrit
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Re: NFS on 10G interface terribly slow

[Rick Macklem]

Gerrit Kuhn wrote:
> Hi all,
> 
> We have a recent FreeBSD 10.1 installation here that is supposed to act as
> nfs (v3) client to an Oracle x4-2l server running Soalris 11.2.
> We have Intel 10-Gigabit X540-AT2 NICs on both ends, iperf is showing
> plenty of bandwidth (9.xGB/s) in both directions.
> However, nfs appears to be terribly slow, especially for writing:
> 
> root@crest:~ # dd if=/dev/zero of=/net/hellpool/Z bs=1024k count=1000
> 1000+0 records in
> 1000+0 records out
> 1048576000 bytes transferred in 20.263190 secs (51747824 bytes/sec)
> 
Recent commits to stable/10 (not in 10.1) done by Alexander Motin (mav@)
might help w.r.t. write performance (it avoids large writes doing synchronous
writes when the wcommitsize is exceeded). If you can try stable/10, that
might be worth it.

Otherwise, the main mount option you can try is "wcommitsize", which you
probably want to make larger.
(It sounds like you already tried most of what I could suggest.)

> 
> Reading appears to be faster, but still far away from full bandwidth:
> 
> root@crest:~ # dd of=/dev/null if=/net/hellpool/Z bs=1024k
> 1000+0 records in
> 1000+0 records out
> 1048576000 bytes transferred in 5.129869 secs (204406000 bytes/sec)
> 
You could try increasing readahead. Look for the mount option and try
cranking it up to 8 or 16.

Good luck with it, rick

> 
> We have already tried to tune rsize/wsize parameters, but they appear to
> have little (if any) impact on these results. Also, neither stripping down
> rxsum, txsum, tso etc. from the interface nor increasing MTU to 9000 for
> jumbo frames did improve anything.
> It is quite embarrassing to achieve way less than 1GBE performance with
> 10GBE equipment. Are there any hints what else might be causing this (and
> how to fix it)?
> 
> 
> cu
>   Gerrit
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