----- Original Message ----
> From: Stuart Henderson <[email protected]>
> To: James Peltier <[email protected]>
> Cc: Andre Keller <[email protected]>; [email protected]
> Sent: Wed, September 22, 2010 12:31:43 PM
> Subject: Re: em(4) ierrs [solved]
>
>
> the "livelock" counter means a timeout wasn't reached in time,
> indicating the system being too busy to run userland.
> (see m_cltick(), m_cldrop() etc in sys/kern/uipc_mbuf.c,
> and the video from asiabsdcon starting about 15 minutes into
> http://www.youtube.com/watch?v=fv-AQJqUzRI).
>
> when this happens, nics with drivers using the MCLGETI mechanism
> halve the size of their receive rings, so that packets drop
> earlier, more effectively limiting system load than if they
> were allowed to proceed up the network stack.
>
> so for some reason or other the timeout wasn't processed
> quickly enough and the system responds in this way to limit
> the overload. so the challenge is to identify what causes
> the system to become non-responsive (could be in the network
> stack or could be for other reasons) and work out ways
> to alleviate that..
>
>
Thanks for the notes. Below are snapshots of vmstat -i and systat vmstat which
do show "high" interrupt levels (6-12k). I put quotes around high because I'm
not really sure if that is high.
That said, is there any benefit to the use of blocknonip clause being added to
the bridge devices?
I also note, that according to the m_cldrop() that the "halving" is done on all
interfaces. This seems odd, in that, if you had a device with multiple cards
that all traffic would be affected at the expense of one. Am I correct in this?
# vmstat -i
interrupt total rate
irq0/clock 819075628 199
irq0/ipi 20855029 5
irq112/em0 12478765512 3047
irq113/em1 13607027530 3322
irq113/bge1 12635532 3
irq97/uhci1 1949 0
irq96/ehci0 22 0
irq98/pciide0 5204039 1
irq145/com0 339 0
Total 26943565580 6578
and
#systat vmstat
1 users Load 0.64 0.67 0.66 Wed Sep 22 16:56:35 2010
memory totals (in KB) PAGING SWAPPING Interrupts
real virtual free in out in out 11067 total
Active 15388 15388 2918228 ops 200 clock
All 383480 383480 6585880 pages 48 ipi
5586 em0
Proc:r d s w Csw Trp Sys Int Sof Flt 1 forks 5212 em1
7 101 561 1525 9438 105 595 fkppw 21 bge1
fksvm uhci1
18.8%Int 1.3%Sys 1.9%Usr 0.0%Nic 77.9%Idle pwait ehci0
| | | | | | | | | | | relck pciide0
|||||||||=> rlkok com0
noram
Namei Sys-cache Proc-cache No-cache 96 ndcpy
Calls hits % hits % miss % 18 fltcp
55 55 100 106 zfod
31 cow
Disks wd0 cd0 27514 fmin
seeks 36685 ftarg
xfers itarg
speed 17 wired
sec pdfre
pdscn
pzidle
13 kmapent
---
James A. Peltier [email protected]
