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From: Jens Axboe <axboe@suse.de>
To: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: [PATCH] Time sliced cfq ver17
Date: Thu, 16 Dec 2004 16:34:16 +0100	[thread overview]
Message-ID: <20041216153416.GC23414@suse.de> (raw)
In-Reply-To: <20041215120323.GT3157@suse.de>

Hi,

2.6.10-rc3-mm1 patch:

http://www.kernel.org/pub/linux/kernel/people/axboe/patches/v2.6/2.6.10-rc3-mm1/cfq-time-slices-17-2.6.10-rc3-mm1.gz

2.6-BK patch:

http://www.kernel.org/pub/linux/kernel/people/axboe/patches/v2.6/2.6.10-rc3/cfq-time-slices-17.gz

Changes:

- Kill the spare queue logic

- wait_request should not imply that queue must be allowed to allocate a
  request, otherwise a write could quickly flood the queue. Add
  must_alloc to handle that and make it one-shot.

- Turn on/off idle window based on process think time and seek time.
  Improve idle timer logic. The seek/think time updates toggle the
  idle_window flag and increase queuing depth if we disable the idle
  window.

- Improve SCSI requeing logic. Add request fully back into cfq queue but
  mark it as next service once this queue gets slice time again.

- More preemption fixes. Allow new sync io to preempt equal priority
  async io to improve reader fairness.

-- 
Jens Axboe


      reply	other threads:[~2004-12-16 15:34 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-12-15  8:20 [PATCH] Time sliced cfq ver13 Jens Axboe
2004-12-15 12:03 ` [PATCH] Time sliced cfq ver14 Jens Axboe
2004-12-16 15:34   ` Jens Axboe [this message]

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