From: Christoph Hellwig <hch@infradead.org>
To: Jens Axboe <axboe@suse.de>
Cc: Christoph Hellwig <hch@infradead.org>,
torvalds@osdl.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] slabify iocontext + request_queue
Date: Sat, 15 May 2004 20:50:22 +0100 [thread overview]
Message-ID: <20040515205022.A4788@infradead.org> (raw)
In-Reply-To: <20040515173004.GA962@suse.de>; from axboe@suse.de on Sat, May 15, 2004 at 07:30:04PM +0200
On Sat, May 15, 2004 at 07:30:04PM +0200, Jens Axboe wrote:
> > While I agree on the io_context part, slabifying request_queue is a space
> > waste on most machines out there. The averange desktop has less than a
> > handfull of these, and even for smaller servers it doesn't exactly look
> > like a gain.
>
> See the thread last week on queue congestion threshold calculations,
> there were some numbers in there.
Maybe my math is completely off, but with slab you'd need a page at least,
the kmem_cache_t and maybe a kmem_bufctl_t
So for the usual two or three queue desktops we went from 1024 or 1536
to 4096 + N.
Cutoff point is at aproximately 9 queues which I think most machines running
linux won't reach.
Anyway, not that this is really important, I think we just need to question
all this silent bloating a little..
prev parent reply other threads:[~2004-05-15 19:50 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-15 18:07 [PATCH] slabify iocontext + request_queue Christoph Hellwig
2004-05-15 17:30 ` Jens Axboe
2004-05-15 19:50 ` Christoph Hellwig [this message]
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