From: Bart Van Assche <bvanassche@acm.org>
To: Kashyap.Desai@avagotech.com, linux-scsi@vger.kernel.org,
hch@infradead.org, elliott@hp.com, jbottomley@parallels.com,
aacraid@adaptec.com
Subject: Re: [PATCH/RESEND] scsi.mq: Added use_cmd_list flag in scsi_host to reduce lock contention
Date: Fri, 22 Aug 2014 18:04:17 +0200 [thread overview]
Message-ID: <53F76A01.7060806@acm.org> (raw)
In-Reply-To: <201408201357.s7KDvDeL021549@palmhbs0.lsi.com>
On 08/20/14 15:54, Kashyap.Desai@avagotech.com wrote:
> Comment provided by Bart Van and Chris H is addressed in this patch.
>
> Add use_cmd_list flag in scsi_host to indicate scs.mq stack
> to keep track of cmd_list per sdev.
>
> Default behaviour is not to keep track of cmd_list per sdev, as this may introduce
> lock contention. (overhead is more on multi-node NUMA.)
>
> Patch is tested using megaraid_sas driver with "use_cmd_list" value set to 1 and 0.
> Added MAINTAINER of Adaptec to verify changes.
>
> Signed-off-by: Kashyap Desai <kashyap.desai@avagotech.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
next prev parent reply other threads:[~2014-08-22 16:04 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-20 13:54 [PATCH/RESEND] scsi.mq: Added use_cmd_list flag in scsi_host to reduce lock contention Kashyap.Desai
2014-08-20 15:47 ` Martin K. Petersen
2014-08-22 16:04 ` Bart Van Assche [this message]
2014-08-24 16:26 ` Christoph Hellwig
-- strict thread matches above, loose matches on Subject: below --
2014-08-20 13:28 Kashyap.Desai
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=53F76A01.7060806@acm.org \
--to=bvanassche@acm.org \
--cc=Kashyap.Desai@avagotech.com \
--cc=aacraid@adaptec.com \
--cc=elliott@hp.com \
--cc=hch@infradead.org \
--cc=jbottomley@parallels.com \
--cc=linux-scsi@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.