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

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Date:	Wed, 29 Oct 2008 12:50:37 +0300
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Mike Galbraith <efault@....de>, David Miller <davem@...emloft.net>,
	alan@...rguk.ukuu.org.uk, jkosina@...e.cz,
	akpm@...ux-foundation.org, a.p.zijlstra@...llo.nl, 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 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.

-- 
	Evgeniy Polyakov
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