netdev - Re: [tbench regression fixes]: digging out smelly deadmen.

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Message-ID: <4d8e3fd30811010551s4163d81bi96dcd98fb3440b72@mail.gmail.com>
Date:	Sat, 1 Nov 2008 13:51:39 +0100
From:	"Paolo Ciarrocchi" <paolo.ciarrocchi@...il.com>
To:	"Evgeniy Polyakov" <zbr@...emap.net>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>
Cc:	"Mike Galbraith" <efault@....de>,
	"David Miller" <davem@...emloft.net>, alan@...rguk.ukuu.org.uk,
	jkosina@...e.cz, akpm@...ux-foundation.org, rjw@...k.pl,
	s0mbre@...rvice.net.ru, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [tbench regression fixes]: digging out smelly deadmen.

On Wed, Oct 29, 2008 at 10:50 AM, Evgeniy Polyakov <zbr@...emap.net> wrote:
> On Wed, Oct 29, 2008 at 12:14:05PM +0300, Evgeniy Polyakov (zbr@...emap.net) wrote:
>> vanilla 27    : 347.222
>> no TSO/GSO    : 357.331
>> no hrticks    : 382.983
>> no balance    : 389.802
>> 4403b4 commit : 361.184
>> dirty_ratio-50        : 361.086
>> no-sched-tweaks       : 361.367
>>
>> So, probably, if we revert -tip merge to vanilla .27, add nohrtick patch
>> and nobalance tweak _only_, and apply naive TSO patch we could bring
>> system to 400 MB/s. Note, that .22 has 479.82 and .23 454.36 MB/s.
>
> And now I have to admit that the very last -top merge did noticebly
> improve the situation upto 391.331 MB/s (189 in domains, with tso/gso
> off and naive tcp_tso_should_defer() hange).
>
> So we are now essentially at the level of 24-25 trees in my tests.

That's good and make think whether it would be a good idea to add some
performance number in each pull request that affect the core part of
the kernel.

Ciao,
-- 
Paolo
http://paolo.ciarrocchi.googlepages.com/
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