From: Jens Axboe <jens.axboe@oracle.com>
To: Kai Makisara <Kai.Makisara@kolumbus.fi>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>,
John Stoffel <john@stoffel.org>,
linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org
Subject: Re: [PATCH 00/33] SG table chaining support
Date: Mon, 16 Jul 2007 18:43:10 +0200 [thread overview]
Message-ID: <20070716164309.GA5195@kernel.dk> (raw)
In-Reply-To: <Pine.LNX.4.64.0707161852380.5065@kai.makisara.local>
On Mon, Jul 16 2007, Kai Makisara wrote:
> On Mon, 16 Jul 2007, Martin K. Petersen wrote:
>
> > >>>>> "John" == John Stoffel <john@stoffel.org> writes:
> >
> > John> Will this help out tape drive performance at all? I looked
> > John> through the patches quickly, esp the AIC7xxx stuff since that's
> > John> what I use, but nothing jumped out at me...
> >
> > Yes. Most modern tape drives want a block size of 1MB or higher.
> > With the old stack we'd be stuck at 512KB because the sg limitations
> > caused us to come just short of 1MB...
> >
> Tape block sizes up to 16 MB have been possible for a very long time but
> this has required tuning of the block/scsi parameters. Very few people
> seem to have done this and the common (mis)belief seems to be that the
> tape block size limit has been 512 kB. It is good if this tuning is not
> needed in future.
The main difference is now you get to do it without hacks and in a clean
way, so it works through the normal IO path and not some on-the-side
thing (or st only).
--
Jens Axboe
prev parent reply other threads:[~2007-07-16 16:43 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-16 9:47 [PATCH 00/33] SG table chaining support Jens Axboe
2007-07-16 9:47 ` [PATCH 01/33] crypto: don't pollute the global namespace with sg_next() Jens Axboe
2007-07-16 9:47 ` [PATCH 02/33] Add sg helpers for iterating over a scatterlist table Jens Axboe
2007-07-16 9:47 ` [PATCH 03/33] block: convert to using sg helpers Jens Axboe
2007-07-16 19:21 ` Bartlomiej Zolnierkiewicz
2007-07-16 19:14 ` Jens Axboe
2007-07-16 9:47 ` [PATCH 04/33] scsi: " Jens Axboe
2007-07-16 9:47 ` [PATCH 05/33] Add chained sg support to linux/scatterlist.h Jens Axboe
2007-07-16 19:21 ` Bartlomiej Zolnierkiewicz
2007-07-16 19:15 ` Jens Axboe
2007-07-16 9:47 ` [PATCH 06/33] i386 dma_map_sg: convert to using sg helpers Jens Axboe
2007-07-16 9:47 ` [PATCH 07/33] i386: enable sg chaining Jens Axboe
2007-07-16 9:47 ` [PATCH 08/33] swiotlb: sg chaining support Jens Axboe
2007-07-16 9:47 ` [PATCH 09/33] x86-64: update iommu/dma mapping functions to sg helpers Jens Axboe
2007-07-16 20:06 ` Andrew Morton
2007-07-16 20:10 ` Jens Axboe
2007-07-16 20:34 ` Andrew Morton
2007-07-16 22:08 ` Muli Ben-Yehuda
2007-07-17 7:38 ` Jens Axboe
2007-07-17 8:49 ` Muli Ben-Yehuda
2007-07-17 8:51 ` Jens Axboe
2007-07-17 9:00 ` Muli Ben-Yehuda
2007-07-17 7:02 ` Jens Axboe
2007-07-17 7:56 ` Jens Axboe
2007-07-17 11:03 ` Muli Ben-Yehuda
2007-07-17 11:05 ` Jens Axboe
2007-07-17 11:10 ` Muli Ben-Yehuda
2007-07-16 9:47 ` [PATCH 10/33] x86-64: enable sg chaining Jens Axboe
2007-07-16 9:47 ` [PATCH 11/33] IA64: sg chaining support Jens Axboe
2007-07-16 9:47 ` [PATCH 12/33] PPC: " Jens Axboe
2007-07-16 9:47 ` [PATCH 13/33] SPARC: " Jens Axboe
2007-07-16 11:29 ` David Miller
2007-07-16 9:47 ` [PATCH 14/33] SPARC64: " Jens Axboe
2007-07-16 11:29 ` David Miller
2007-07-16 9:47 ` [PATCH 15/33] scsi: simplify scsi_free_sgtable() Jens Axboe
2007-07-16 9:47 ` [PATCH 16/33] SCSI: support for allocating large scatterlists Jens Axboe
2007-07-16 9:47 ` [PATCH 17/33] ll_rw_blk: temporarily enable max_segments tweaking Jens Axboe
2007-07-16 9:47 ` [PATCH 18/33] libata: convert to using sg helpers Jens Axboe
2007-07-16 9:47 ` [PATCH 19/33] scsi_debug: support sg chaining Jens Axboe
2007-09-08 14:53 ` Douglas Gilbert
2007-07-16 9:47 ` [PATCH 20/33] scsi generic: sg chaining support Jens Axboe
2007-07-16 9:47 ` [PATCH 21/33] qla1280: " Jens Axboe
2007-07-16 9:47 ` [PATCH 22/33] aic94xx: " Jens Axboe
2007-07-16 9:47 ` [PATCH 23/33] qlogicpti: " Jens Axboe
2007-07-16 9:47 ` [PATCH 24/33] ide-scsi: " Jens Axboe
2007-07-18 21:03 ` Bartlomiej Zolnierkiewicz
2007-07-16 9:47 ` [PATCH 25/33] gdth: " Jens Axboe
2007-07-16 9:47 ` [PATCH 26/33] aha1542: convert to use the data buffer accessors Jens Axboe
2007-07-16 9:47 ` [PATCH 27/33] advansys: " Jens Axboe
2007-07-16 9:47 ` [PATCH 28/33] ia64 simscsi: convert to use " Jens Axboe
2007-07-16 9:47 ` [PATCH 29/33] infiniband: sg chaining support Jens Axboe
2007-07-16 13:21 ` FUJITA Tomonori
2007-07-16 13:26 ` Jens Axboe
2007-07-16 9:47 ` [PATCH 30/33] USB storage: " Jens Axboe
2007-07-17 6:12 ` Greg KH
2007-07-17 7:01 ` Jens Axboe
2007-07-17 7:05 ` Greg KH
2007-07-17 7:07 ` Jens Axboe
2007-07-16 9:47 ` [PATCH 31/33] Fusion: " Jens Axboe
2007-07-16 13:20 ` FUJITA Tomonori
2007-07-16 13:25 ` Jens Axboe
2007-07-16 9:47 ` [PATCH 32/33] i2o: " Jens Axboe
2007-07-16 9:47 ` [PATCH 33/33] IDE: " Jens Axboe
2007-07-18 20:56 ` Bartlomiej Zolnierkiewicz
2007-07-19 6:19 ` Jens Axboe
2007-07-16 13:19 ` [PATCH 00/33] SG table " FUJITA Tomonori
2007-07-16 13:23 ` Jens Axboe
2007-07-16 13:19 ` FUJITA Tomonori
2007-07-16 13:24 ` Jens Axboe
2007-07-16 14:05 ` John Stoffel
2007-07-16 14:23 ` Martin K. Petersen
2007-07-16 14:43 ` Jens Axboe
2007-07-16 16:02 ` Kai Makisara
2007-07-16 16:43 ` Jens Axboe [this message]
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