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From: Andrew Morton <akpm@osdl.org>
To: Peter Osterlund <petero2@telia.com>
Cc: axboe@suse.de, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Speed up the cdrw packet writing driver
Date: Tue, 24 Aug 2004 15:56:35 -0700	[thread overview]
Message-ID: <20040824155635.3d1a1dd6.akpm@osdl.org> (raw)
In-Reply-To: <m3d61gchyb.fsf@telia.com>

Peter Osterlund <petero2@telia.com> wrote:
>
> > Are you saying that your requests are so huge that each one has 1000 BIOs? 
> > That would be odd, for an IDE interface.
> 
> No, the thing is that the packet driver doesn't create requests at
> all. It stuffs incoming bio's in the rbtree, then the worker thread
> collects bio's from the rbtree for the same "zone" on the disc (each
> zone is 64kb on a CDRW and 32KB on a DVD). The driver then creates a
> new bio with the same size as the zone size and submits it to the real
> CD/DVD device.

Good lord.  I assume there's a good reason for this?

  reply	other threads:[~2004-08-24 22:54 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-08-14 19:13 [PATCH] Speed up the cdrw packet writing driver Peter Osterlund
2004-08-23 11:43 ` Jens Axboe
2004-08-23 16:07   ` Peter Osterlund
2004-08-24 20:29     ` Jens Axboe
2004-08-24 21:04       ` Peter Osterlund
2004-08-24 21:47         ` Andrew Morton
2004-08-24 21:57           ` Lee Revell
2004-08-29 13:52             ` Alan Cox
2004-08-24 22:03           ` Peter Osterlund
2004-08-24 22:56             ` Andrew Morton [this message]
2004-08-25  5:38               ` Peter Osterlund
2004-08-25  6:50         ` Jens Axboe
2004-08-28  9:59           ` Peter Osterlund
2004-08-28 13:07             ` Jens Axboe
2004-08-28 18:42               ` Peter Osterlund
2004-08-28 19:45                 ` Andrew Morton
2004-08-28 20:57                   ` Peter Osterlund
2004-08-28 21:23                     ` Andrew Morton
2004-08-29 12:17                       ` Peter Osterlund

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