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Date: Thu, 13 Oct 2011 21:28:57 +0530
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From: "Jayachandran C." <jchandra@freebsd.org>
To: Adrian Chadd <adrian@freebsd.org>
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Cc: Kostik Belousov <kostikbel@gmail.com>, Alexander Motin <mav@freebsd.org>,
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Subject: Re: svn commit: r225892 - head/sys/mips/mips
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Hi Adrian,

On Tue, Oct 4, 2011 at 9:48 PM, Adrian Chadd <adrian@freebsd.org> wrote:
> On 4 October 2011 23:48, Adrian Chadd <adrian@freebsd.org> wrote:
>> Hi all,
>>
>> I've tried jc's patch. The hand-wavy, brief summary when tested on my
>> hostap (mips):
>>
>> * when doing single-stream, one way TCP tests (where it thus needs
>> TX/RX traffic to occur), I get 100% CPU utilisation - 50% interrupt,
>> 50% system, but the total interrupt rate isn't too high. It's much
>> higher than without his patch. I'll go digging later to see what's
>> going on.
>
> This turns out to be my fault. I seem to have somehow messed up
> something in one of my more recent commits.
> I'm quite certain that it won't have any impact on the results, as I
> never see the interrupt latency issue with bidirectional traffic.
>
> The UDP results are correct though - jc's stuff hasn't entirely fixed
> it. I'll do some more testing tomorrow morning and report what I find.

I'm thinking of checking in this patch so that it gets wider testing.
Did you get a chance to do the tests?

The patch does not cause any further problems  for me on XLR/XLP - I
have been testing it for a few days.  But I don't really have a
testcase for the issue you see.

JC.