From: Luben Tuikov <luben@splentec.com>
To: linux-scsi <linux-scsi@vger.kernel.org>
Subject: Q: relationship between can_queue and cmd_per_lun?
Date: Fri, 21 Jun 2002 15:40:24 -0400 [thread overview]
Message-ID: <3D138128.C25C70D5@splentec.com> (raw)
Is there any relationship between Scsi_Host::can_queue
and Scsi_Host::cmd_per_lun?
Given that there is only one device (one target
with a signle LUN) on a Scsi_Host, then what would
be the sense of can_queue=255 and cmd_per_lun=1?
(other than calling queuecommand() vs the older if.)
If there's a relationship, according to my understanding,
can_queue = LUN present * targets present * cmd_per_lun,
or the more general:
can_queue = \sum_Targets{\sum_Target_LUNS{cmd_per_This_LUN}}.
Can someone shed some light on this?
Also is there any way of finding the tagged queue depth,
other than tracking TASK SET FULL status code?
TIA,
--
Luben
next reply other threads:[~2002-06-21 19:40 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-06-21 19:40 Luben Tuikov [this message]
2002-06-21 19:55 ` Q: relationship between can_queue and cmd_per_lun? Doug Ledford
2002-06-21 21:17 ` Luben Tuikov
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