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From: Andi Kleen <andi@firstfloor.org>
To: Eric Dumazet <dada1@cosmosbay.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>,
	Christoph Lameter <clameter@sgi.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	LKML <linux-kernel@vger.kernel.org>,
	linux-mm@kvack.org
Subject: Re: [git pull] more SLUB updates for 2.6.25
Date: 08 Feb 2008 15:58:05 +0100	[thread overview]
Message-ID: <87ve4z1on6.fsf@basil.nowhere.org> (raw)
In-Reply-To: <47AC04CD.9090407@cosmosbay.com>

Eric Dumazet <dada1@cosmosbay.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

      parent reply	other threads:[~2008-02-08 14:58 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-08  2:13 Christoph Lameter
2008-02-08  7:12 ` Nick Piggin
2008-02-08  7:29   ` Eric Dumazet
2008-02-08  8:08     ` Nick Piggin
2008-02-08  8:10     ` Christoph Lameter
2008-02-09 11:25       ` Eric Dumazet
2008-02-08 14:58     ` Andi Kleen [this message]

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