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From: Takuya ASADA <syuu@dokukino.com>
Date: Tue, 8 Nov 2011 06:09:11 +0900
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To: George Neville-Neil <gnn@neville-neil.com>, Vlad Galu <dudu@dudu.ro>
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Cc: net@freebsd.org
Subject: Re: Multiqueue support for bpf
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Hi,

Probably my previous mail had been skipped or forgot replying, so I'd
like to try notice again.
# This is original post of this thread, if you don't remember what is
this: http://lists.freebsd.org/pipermail/freebsd-net/2011-August/029585.htm=
l

George said "I think we should try to integrate this work and then
tune it up more. in previous mail, then I want to merge this now.

Is there any additional work required to merge, or just fine?

2011/9/22 Takuya ASADA <syuu@dokukino.com>:
> Sorry for late replying,
>
>> One comment, one question.
>>
>> First, I think we should try to integrate this work and then tune it up =
more. =C2=A0The API
>> is, I think, fine, and performance tuning takes a bit of work.
>
> Is there good way(I mean tools or something) to find the bottleneck?
>
>> Second, what are the parameters set on buffers for the drivers? =C2=A0I.=
e. how many slots
>> do they have in their queues etc.? =C2=A0If they defaults are too small,=
 and often they are,
>> then that's going to hurt your performance.
>
> It does equals to number of descriptors per queue, right?
> If I'm correct, it's 2048 descriptors per queue by default, and I used
> default parameter when I perform benchmarks.
>
> It's on line 290 of
> http://p4db.freebsd.org/fileViewer.cgi?FSPC=3D//depot/projects/soc2011/mq=
_bpf/src/sys/dev/ixgbe/ixgbe.c&REV=3D2
>
> and line 105 of
> http://p4db.freebsd.org/fileViewer.cgi?FSPC=3D//depot/projects/soc2011/mq=
_bpf/src/sys/dev/ixgbe/ixgbe.h&REV=3D2
>