From: David Miller <davem@davemloft.net>
To: mpatocka@redhat.com
Cc: andi@firstfloor.org, sparclinux@vger.kernel.org,
linux-kernel@vger.kernel.org, jens.axboe@oracle.com
Subject: Re: [SUGGESTION]: drop virtual merge accounting in I/O requests
Date: Mon, 14 Jul 2008 05:28:59 -0700 (PDT) [thread overview]
Message-ID: <20080714.052859.88212003.davem@davemloft.net> (raw)
In-Reply-To: <Pine.LNX.4.64.0807140805380.10106@devserv.devel.redhat.com>
From: Mikulas Patocka <mpatocka@redhat.com>
Date: Mon, 14 Jul 2008 08:16:13 -0400 (EDT)
> As you mentioned ESP driver, it declares .sg_tablesize = SG_ALL, so
> BIO_VMERGE_BOUNDARY has no effect on the operation of this driver. Any
> other driver where BIO_VMERGE_BOUNDARY does matter?
When BIO_VMERGE_BOUNDARY is turned on, requests that would not
otherwise fit into the device's limits, can.
It's the only way to know ahead of time that the IOMMU is going
to merge things for us.
next prev parent reply other threads:[~2008-07-14 12:29 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
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 [this message]
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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