Date: Thu, 08 Oct 2009 17:58:35 +0500 From: rihad <rihad@mail.ru> To: Robert Watson <rwatson@FreeBSD.org> Cc: freebsd-net@freebsd.org, Eugene Grosbein <eugen@kuzbass.ru>, Luigi Rizzo <rizzo@iet.unipi.it>, Julian Elischer <julian@elischer.org> Subject: Re: dummynet dropping too many packets Message-ID: <4ACDE1FB.6020602@mail.ru> In-Reply-To: <alpine.BSF.2.00.0910071420290.38033@fledge.watson.org> References: <4AC9E29B.6080908@mail.ru> <20091005123230.GA64167@onelab2.iet.unipi.it> <4AC9EFDF.4080302@mail.ru> <4ACA2CC6.70201@elischer.org> <4ACAFF2A.1000206@mail.ru> <4ACB0C22.4000008@mail.ru> <20091006100726.GA26426@svzserv.kemerovo.su> <4ACB42D2.2070909@mail.ru> <20091006142152.GA42350@svzserv.kemerovo.su> <4ACB6223.1000709@mail.ru> <20091006161240.GA49940@svzserv.kemerovo.su> <alpine.BSF.2.00.0910061804340.50283@fledge.watson.org> <4ACC5563.602@mail.ru> <4ACC56A6.1030808@mail.ru> <alpine.BSF.2.00.0910070957430.58146@fledge.watson.org> <4ACC5DEC.1010006@mail.ru> <alpine.BSF.2.00.0910071036280.58146@fledge.watson.org> <4ACC65A0.7030900@mail.ru> <alpine.BSF.2.00.0910071312420.58146@fledge.watson.org> <4ACC8CC8.8050403@mail.ru> <alpine.BSF.2.00.0910071420290.38033@fledge.watson.org>
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Robert Watson wrote:
> I would suggest making just the HZ -> 4000 change for now and see how
> it goes.
>
2018 users online, 73 drops have just occurred.
p.s.: already 123 drops.
It will only get worse after some time.
Traffic load: 440-450 mbps.
top -HS:
last pid: 68314; load averages: 1.35, 1.22, 1.25
up 0+05:13:28 17:53:49
145 processes: 11 running, 118 sleeping, 16 waiting
CPU: 1.4% user, 0.0% nice, 2.8% system, 10.3% interrupt, 85.5% idle
Mem: 1337M Active, 1683M Inact, 355M Wired, 40K Cache, 214M Buf, 560M Free
Swap: 2048M Total, 2048M Free
PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND
14 root 171 ki31 0K 16K CPU4 4 257:35 99.41% idle: cpu4
12 root 171 ki31 0K 16K RUN 6 286:39 98.14% idle: cpu6
18 root 171 ki31 0K 16K RUN 0 225:16 92.72% idle: cpu0
15 root 171 ki31 0K 16K RUN 3 255:35 90.04% idle: cpu3
16 root 171 ki31 0K 16K CPU2 2 272:04 87.40% idle: cpu2
13 root 171 ki31 0K 16K CPU5 5 260:52 81.69% idle: cpu5
17 root 171 ki31 0K 16K CPU1 1 239:06 75.29% idle: cpu1
21 root -44 - 0K 16K CPU7 7 108:49 57.37% swi1: net
11 root 171 ki31 0K 16K CPU7 7 267:48 49.02% idle: cpu7
29 root -68 - 0K 16K WAIT 1 41:45 20.90% irq256: bce0
470 root -68 - 0K 16K - 5 27:01 9.18% dummynet
19 root -32 - 0K 16K WAIT 1 16:13 6.59% swi4:
clock sio
31 root -68 - 0K 16K WAIT 2 9:35 4.35% irq257: bce1
> Robert Watson wrote:
> Suggestions like increasing timer resolution are intended to spread
> out the injection of packets by dummynet to attempt to reduce the
> peaks of burstiness that occur when multiple queues inject packets in
> a burst that exceeds the queue depth supported by combined hardware
> descriptor rings and software transmit queue.
How to tweak the software transmit queue?
P.S.: still only 123 drops (while io_pkt_drop: 0, intr_queue_drops: 0),
but it was a warning.
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