From: Andrew Morton <akpm@osdl.org>
To: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
Cc: axboe@suse.de, linux-kernel@vger.kernel.org
Subject: Re: Cache queue_congestion_on/off_threshold
Date: Thu, 6 May 2004 20:02:10 -0700 [thread overview]
Message-ID: <20040506200210.44b04c38.akpm@osdl.org> (raw)
In-Reply-To: <200405062030.i46KUuF13625@unix-os.sc.intel.com>
"Chen, Kenneth W" <kenneth.w.chen@intel.com> wrote:
>
> >>>> Jens Axboe wrote on Wed, May 05, 2004 11:43 PM
> > On Wed, May 05 2004, Andrew Morton wrote:
> > > Jens Axboe <axboe@suse.de> wrote:
> > > >
> > > > Do you have any numbers at all for this? I'd say these calculations are
> > > > severly into the noise area when submitting io.
> > >
> > > The difference will not be measurable, but I think the patch makes sense
> > > regardless of what the numbers say.
> >
> > Humm dunno, I'd rather save the sizeof(int) * 2.
>
> Strictly speaking from memory consumption point of view, it probably comes
> for free since sizeof(struct request_queue) currently is 456 bytes on x86
> and 816 on 64bit arch. The structure is being rounded to 512 or 1024 with
> kmalloc.
That's a good argument for creating a standalone slab cache for request
queue structures ;)
next prev parent reply other threads:[~2004-05-07 3:02 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-05 22:12 Cache queue_congestion_on/off_threshold Chen, Kenneth W
2004-05-06 6:20 ` Jens Axboe
2004-05-06 6:34 ` Andrew Morton
2004-05-06 6:43 ` Jens Axboe
2004-05-06 20:30 ` Chen, Kenneth W
2004-05-07 3:02 ` Andrew Morton [this message]
2004-05-07 9:35 ` Jens Axboe
2004-05-06 20:29 ` Chen, Kenneth W
2004-05-07 9:39 ` Jens Axboe
2004-05-07 22:00 ` Chen, Kenneth W
2004-05-10 14:30 ` Jens Axboe
2004-05-10 14:43 ` Nick Piggin
2004-05-10 14:44 ` Jens Axboe
2004-05-11 3:22 ` Nick Piggin
2004-05-12 5:32 ` Chen, Kenneth W
2004-05-12 7:05 ` Jens Axboe
2004-05-12 13:48 ` Jens Axboe
2004-05-12 14:22 ` Jens Axboe
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