Date: Mon, 14 Sep 2009 16:23:36 +0500 From: rihad <rihad@mail.ru> To: Barney Cordoba <barney_cordoba@yahoo.com> Cc: freebsd-net@FreeBSD.org Subject: Re: [POLLING] strange interrupt/system load Message-ID: <4AAE27B8.6050006@mail.ru> In-Reply-To: <676338.40771.qm@web63905.mail.re1.yahoo.com> References: <676338.40771.qm@web63905.mail.re1.yahoo.com>
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Barney Cordoba wrote:
>
>> Without polling (current load around 190-200 mbit/s, around
>> 24-26 kpps):
>>
>> top:
>> CPU: 0.0% user, 0.0% nice, 8.4%
>> system, 0.0% interrupt, 91.6% idle
>>
>> Interrupts/s: 18322 total
>> 28 mpt0 irq16
>> 1999 cpu0: time
>> 6906 em0 irq256
>> 3392 em1 irq257
>> 1999 cpu1: time
>> 1999 cpu2: time
>> 1999 cpu3: time
>
> You really need to look at the taskq usage as averaging on a 4 core
CPU: 0.0% user, 0.0% nice, 10.0% system, 0.0% interrupt, 90.0% idle
27 root 1 -68 - 0K 16K - 1 137:47 40.28% em0 taskq
28 root 1 -68 - 0K 16K - 2 5:05 0.88% em1 taskq
> You'll do a lot better setting your ITR to 2000 or so. You really don't
> need an interrupt every 4 packets at those traffic levels.
Sorry, how would I do that? And how do I find the current ITR value?
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