From: Pat LaVarre <p.lavarre@ieee.org>
To: linux-scsi@vger.kernel.org
Subject: bytes/CDB of SCSI pass thru grossly limited maybe
Date: 30 Jul 2004 17:04:12 -0600 [thread overview]
Message-ID: <1091228652.6845.1.camel@patibmrh9> (raw)
Offline a friend reports seeing bytes/CDB of Linux ioctl SG_IO grossly
limited - like down below 0.000000128 GB/CDB for op x3B "WRITE BUFFER".
I'm writing now to give this audience the chance to comment.
Left to myself, I'll hope to work to reproduce that result, compare USB/
PATAPI/ FireWire/ SATAPI, try the alternative of ioctl
CDROM_SEND_PACKET, ... and report back here if/when I discover anything
interesting.
I remember seeing talk of tweaking the kernel to choke off the default
kernel thruput whenever status/ command overhead is high, but before now
I don't remember hearing of choking off SCSI pass thru as well.
Pat LaVarre
http://linux-pel.blog-city.com/read/752705.htm
next reply other threads:[~2004-07-30 23:04 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-30 23:04 Pat LaVarre [this message]
2004-07-31 14:12 ` bytes/CDB of SCSI pass thru grossly limited maybe Jens Axboe
2004-08-16 17:55 ` Pat LaVarre
2004-08-17 18:07 ` Pat LaVarre
2004-08-23 15:46 ` Jens Axboe
2004-08-23 16:05 ` Pat LaVarre
2004-08-23 17:08 ` Jens Axboe
2004-08-23 17:28 ` Pat LaVarre
2004-08-23 18:17 ` Jens Axboe
2004-08-26 23:20 ` Pat LaVarre
2004-08-23 16:06 ` Jeff Garzik
2004-08-23 17:05 ` Pat LaVarre
2004-08-23 18:48 ` Luben Tuikov
2004-08-23 19:06 ` Jeff Garzik
2004-08-23 19:14 ` Luben Tuikov
[not found] <A8E06BE4-F7BA-11D8-AC6B-00039398BB5E@ieee.org>
[not found] ` <Pine.LNX.4.44L0 .0408271100590.1238-100000@ida.rowland.org>
2004-08-27 15:09 ` Alan Stern
2004-08-28 14:31 ` Jens Axboe
2004-08-28 15:14 ` Alan Stern
2004-08-28 15:36 ` Jens Axboe
2004-08-28 17:51 ` James Bottomley
2004-08-28 17:55 ` Jens Axboe
2004-08-28 18:20 ` James Bottomley
2004-08-28 18:41 ` Jens Axboe
2004-08-29 13:34 ` James Bottomley
2004-08-29 13:45 ` Jens Axboe
2004-08-30 18:15 ` Pat LaVarre
2004-09-01 15:20 ` Pat LaVarre
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