From: Mikulas Patocka <mpatocka@redhat.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: sparclinux@vger.kernel.org, linux-kernel@vger.kernel.org,
Jens Axboe <jens.axboe@oracle.com>
Subject: Re: [SUGGESTION]: drop virtual merge accounting in I/O requests
Date: Sun, 13 Jul 2008 09:34:33 -0400 (EDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0807130933120.24489@devserv.devel.redhat.com> (raw)
In-Reply-To: <87iqvb2skz.fsf@basil.nowhere.org>
> Mikulas Patocka <mpatocka@redhat.com> writes:
>
>> I'm getting crashes with InitIO A100u2w controller on Sparc64 (I had
>> to fix the endianity issues in the driver, but that's unrelated).
>
> x86-64 (and powerpc) solved this a long time ago by only doing
> opportunistic merging: as in don't announce to the block layer
> that you can merge, but try to merge anyways. This way SG lists
> are not necessarily filled completely, but it's still better
> than overflowing them in some rare cases.
>
> -Andi
There's option "biomerge" that enables that feature. I'm wondering, if
there's some situation when it should be used.
Mikulas
next prev parent reply other threads:[~2008-07-13 13:35 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-10 21:56 Mikulas Patocka
2008-07-10 22:59 ` Julian Calaby
2008-07-10 23:57 ` Mikulas Patocka
2008-07-11 6:20 ` FUJITA Tomonori
2008-07-11 10:52 ` Mikulas Patocka
2008-07-11 11:15 ` FUJITA Tomonori
2008-07-11 19:41 ` David Miller
2008-07-11 20:22 ` Mikulas Patocka
2008-07-12 12:30 ` Andi Kleen
2008-07-13 13:34 ` Mikulas Patocka [this message]
2008-07-13 13:50 ` Andi Kleen
2008-07-13 19:46 ` David Miller
2008-07-13 20:13 ` Andi Kleen
2008-07-13 23:53 ` Mikulas Patocka
2008-07-14 0:48 ` David Miller
2008-07-14 12:16 ` Mikulas Patocka
2008-07-14 12:28 ` David Miller
2008-07-14 14:03 ` Mikulas Patocka
2008-07-14 21:37 ` David Miller
2008-07-14 23:16 ` Mikulas Patocka
2008-07-15 1:31 ` David Miller
2008-07-15 22:32 ` Mikulas Patocka
2008-07-15 22:37 ` David Miller
2008-07-15 22:59 ` Mikulas Patocka
2008-07-15 2:40 ` FUJITA Tomonori
2008-07-14 0:41 ` David Miller
2008-07-14 2:19 ` FUJITA Tomonori
2008-07-14 3:20 ` David Miller
2008-07-14 17:45 ` FUJITA Tomonori
2008-07-14 21:26 ` Mikulas Patocka
2008-07-15 2:40 ` FUJITA Tomonori
2008-07-15 12:09 ` Mikulas Patocka
2008-07-15 12:15 ` Andi Kleen
2008-07-15 13:16 ` Mikulas Patocka
2008-07-15 14:06 ` Andi Kleen
2008-07-15 12:19 ` FUJITA Tomonori
2008-07-16 3:10 ` David Miller
2008-07-16 4:38 ` FUJITA Tomonori
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