linux-kernel - Re: [git pull] more SLUB updates for 2.6.25

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Message-ID: <87ve4z1on6.fsf@basil.nowhere.org>
Date:	08 Feb 2008 15:58:05 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	Christoph Lameter <clameter@....com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [git pull] more SLUB updates for 2.6.25

Eric Dumazet <dada1@...mosbay.com> writes:
> 
> What about IRQ masking then ?
> 
> Many CPU pay high cost for cli/sti pair...

Many? In the x86 world only P4. On the other cores cli/sti (and even
pushf ; cli ; popf) is reasonably fast.

> 
> And SLAB/SLUB allocators, even if only used from process context, want
> to disable/re-enable interrupts...
> 
> I understand kmalloc() want generic pools, but dedicated pools could
> avoid this cli/sti

While there are a lot of P4s around they are obsolete by now and I would
advise against major redesigns for tuning obsolete CPUs.

-Andi
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