linux-kernel - Re: Major regression on hackbench with SLUB (more numbers)

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Message-ID: <20071222094459.GE26157@elte.hu>
Date:	Sat, 22 Dec 2007 10:45:00 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	David Miller <davem@...emloft.net>
Cc:	clameter@....com, a.p.zijlstra@...llo.nl,
	torvalds@...ux-foundation.org, rostedt@...dmis.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	hch@...radead.org, rjw@...k.pl
Subject: Re: Major regression on hackbench with SLUB (more numbers)


* David Miller <davem@...emloft.net> wrote:

> From: Ingo Molnar <mingo@...e.hu>
> Date: Fri, 21 Dec 2007 23:54:13 +0100
> 
> > Really, if your behavior is representative of how our SLAB allocator 
> > will be maintained in the future then i'm very, very worried :-(
> 
> Actually, to the contrary, I actually think Christoph responds to 
> every problem I've ever reported to him about his per-cpu counters 
> work and SLUB much better than most people who call themselves 
> "maintainers" around here.
> 
> And I say that without any reservations.
> 
> He doesn't deserve the ad-hominem attacks he is getting today, because 
> he does resolve every problem reported to him.
>
> The guy wrote test cases, he analyzed every problem, he wrote test 
> patches, and he doesn't stop doing any of that until the issue really 
> is reported as resolved by the testers.
> 
> I'll take Christoph as the implementor and maintainer of anything, any 
> day of the week.  He rocks.

well, maybe i got unlucky, this hackbench thing being the first time i'm 
exposed to a major SLUB regression. The hackbench problem was dead easy 
to reproduce, i (and others) offered immediate testing of whatever test 
patches, it also matched the profiles of the TPC-C regression but still 
i was only offered explanations about why this workload does not matter 
and how others suck because they are unable to give immediate test 
feedback from millions-of-dollars test equipment that is barely able to 
run our devel kernels. The regression is fixed now and i'm a happy 
camper!

Christoph, i'd like to apologize for all overly harsh words i said. (and 
i said quite a few :-/ )

	Ingo
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