From: Jens Axboe <axboe@suse.de>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: Zlatko Calusic <zlatko.calusic@iskon.hr>,
Marcelo Tosatti <marcelo@conectiva.com.br>,
linux-mm@kvack.org, lkml <linux-kernel@vger.kernel.org>
Subject: Re: xmm2 - monitor Linux MM active/inactive lists graphically
Date: Thu, 25 Oct 2001 19:33:43 +0200 [thread overview]
Message-ID: <20011025193343.K4795@suse.de> (raw)
In-Reply-To: <Pine.LNX.4.31.0110250920270.2184-100000@cesium.transmeta.com>
On Thu, Oct 25 2001, Linus Torvalds wrote:
>
> On 25 Oct 2001, Zlatko Calusic wrote:
> >
> > Yes, I definitely have DMA turned ON. All parameters are OK. :)
>
> I suspect it may just be that "queue_nr_requests"/"batch_count" is
> different in -ac: what happens if you tweak them to the same values?
>
> (See drivers/block/ll_rw_block.c)
>
> I think -ac made the queues a bit deeper the regular kernel does 128
> requests and a batch-count of 16, I _think_ -ac does something like "2
> requests per megabyte" and batch_count=32, so if you have 512MB you should
> try with
>
> queue_nr_requests = 1024
> batch_count = 32
Right, -ac keeps the elevator flow control and proper queue sizes.
--
Jens Axboe
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next prev parent reply other threads:[~2001-10-25 17:33 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-10-24 10:42 Zlatko Calusic
2001-10-24 14:26 ` Marcelo Tosatti
2001-10-25 0:25 ` Zlatko Calusic
2001-10-25 4:19 ` Linus Torvalds
2001-10-25 4:57 ` Linus Torvalds
2001-10-25 12:48 ` Zlatko Calusic
2001-10-25 16:31 ` Linus Torvalds
2001-10-25 17:33 ` Jens Axboe [this message]
2001-10-26 9:45 ` Zlatko Calusic
2001-10-26 10:08 ` Zlatko Calusic
2001-10-26 14:39 ` Jens Axboe
2001-10-26 14:57 ` Zlatko Calusic
2001-10-26 15:01 ` Jens Axboe
2001-10-26 16:04 ` Linus Torvalds
2001-10-26 16:57 ` Linus Torvalds
2001-10-26 17:19 ` Linus Torvalds
2001-10-28 17:30 ` Zlatko Calusic
2001-10-28 17:34 ` Linus Torvalds
2001-10-28 17:48 ` Alan Cox
2001-10-28 17:59 ` Linus Torvalds
2001-10-28 18:22 ` Alan Cox
2001-10-28 18:46 ` Linus Torvalds
2001-10-28 19:29 ` Alan Cox
2001-10-28 18:56 ` Andrew Morton
2001-10-30 8:56 ` Jens Axboe
2001-10-30 9:26 ` Zlatko Calusic
2001-10-28 19:13 ` Barry K. Nathan
2001-10-28 21:42 ` Jonathan Morton
2001-11-02 5:52 ` Zlatko's I/O slowdown status Andrea Arcangeli
2001-11-02 20:14 ` Zlatko Calusic
2001-11-02 20:26 ` Rik van Riel
2001-11-02 21:22 ` Zlatko Calusic
2001-11-02 20:57 ` Andrea Arcangeli
2001-11-02 23:23 ` Simon Kirby
2001-10-27 13:14 ` xmm2 - monitor Linux MM active/inactive lists graphically Giuliano Pochini
2001-10-28 5:05 ` Mike Fedyk
2001-10-25 9:07 ` Zlatko Calusic
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