From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugme-daemon@bugzilla.kernel.org
Subject: [Bug 12207] block reads/writes > 122880 bytes to USB tape drive gives EBUSY
Date: Tue, 23 Dec 2008 06:56:05 -0800 (PST)
Message-ID: <20081223145605.5AD95108043@picon.linux-foundation.org>
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http://bugzilla.kernel.org/show_bug.cgi?id=12207
------- Comment #11 from anonymous@kernel-bugs.osdl.org 2008-12-23 06:56 -------
Reply-To: James.Bottomley@HansenPartnership.com
> ------- Comment #6 from stern@rowland.harvard.edu 2008-12-23 05:59 -------
> You can change the max_sectors setting through sysfs. However the last time I
> looked, the block layer limited max_sectors to 512 KB or something on that
> order, so you can't get too much improvement.
>
> Why is a limit of 120 KB unreasonably small? All it means is that you have to
> use more system calls to transfer the same amount of data. Is anything wrong
> with that?
Tapes need large block sizes.
We can accommodate both: Just check for TYPE_TAPE in the
slave_configure() and bump the limit back up. Any USB tape that doesn't
do large block transfers will be truly broken.
James
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