From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: John Bradford <john@grabjohn.com>
Cc: Jens Axboe <axboe@suse.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] take 48-bit lba a bit further
Date: 06 Apr 2003 15:35:25 +0100 [thread overview]
Message-ID: <1049639724.962.7.camel@dhcp22.swansea.linux.org.uk> (raw)
In-Reply-To: <200304061332.h36DWnaD000165@81-2-122-30.bradfords.org.uk>
On Sul, 2003-04-06 at 14:32, John Bradford wrote:
> Then, don't we want to be using 48-bit lba all the time on compatible devices
> instead of falling back to 28-bit when possible to save a small amount of
> instruction overhead? (Or is that what we're doing already? I haven't really
> had the time to follow this thread).
The overhead of the double load of the command registers is microseconds so it
is actually quite a lot, especially since IDE lacks TCQ so neither end of the
link is doing *anything* useful. SCSI has similar problems on older SCSI with
command sending being slow, but the drive is at least doing other commands during
this.
next prev parent reply other threads:[~2003-04-06 15:22 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-06 13:07 Jens Axboe
2003-04-06 13:32 ` John Bradford
2003-04-06 13:32 ` Jens Axboe
2003-04-06 14:35 ` Alan Cox [this message]
2003-04-06 15:47 ` John Bradford
2003-04-06 15:59 ` Jens Axboe
2003-04-06 16:04 ` Jens Axboe
2003-04-06 16:08 ` John Bradford
2003-04-06 16:43 ` Petr Vandrovec
2003-04-06 16:27 ` Alan Cox
2003-04-07 7:50 ` Jens Axboe
[not found] <175955253@toto.iv>
2003-04-06 23:04 ` Peter Chubb
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