netdev - Re: [Pv-drivers] rps and pvdrivers

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Date:	Sat, 4 Sep 2010 10:02:36 -0400
From:	Chetan Loke <chetanloke@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Bhavesh Davda <bhavesh@...are.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"pv-drivers@...are.com" <pv-drivers@...are.com>,
	"therbert@...gle.com" <therbert@...gle.com>
Subject: Re: [Pv-drivers] rps and pvdrivers

On Sat, Sep 4, 2010 at 9:51 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>
> If packets have same rxhash, (same src IP, dst IP, src port, dst port),
> they are directed on a single CPU, and this might explain you cannot
> handle the load, RPS or not.

I tried incrementing the src-macs from the load-generator. Or only the
above 4-tuple entries are used?


>
> cat /proc/net/softnet_stat
>

cat /proc/net/softnet_stat
0655cb87 006dd31b 00096a78 00000000 00000000 00000000 00000000
00000000 00000000 00000dbe
0042feec 00000000 0008ae33 00000000 00000000 00000000 00000000
00000000 00000000 00000000

cat /proc/net/softnet_stat
065d444e 006e669d 00097565 00000000 00000000 00000000 00000000
00000000 00000000 00000dbe
0042ff8c 00000000 0008b83f 00000000 00000000 00000000 00000000
00000000 00000000 00000000

cat /proc/net/softnet_stat
066a6fcf 006fefd9 000988c9 00000000 00000000 00000000 00000000
00000000 00000000 00000dbe
004300bd 00000000 0008c945 00000000 00000000 00000000 00000000
00000000 00000000 00000000



> RPS is good to handle multiple flows, because it can distribute load on
> several cpus. But with a single flow, I guess it might be not that
> useful.

For single flow if it doesn't improve performance that's fine. But it
should atleast work as good as N-2(2.6.33).


Chetan Loke
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