All of lore.kernel.org
 help / color / mirror / Atom feed
From: Bart Van Assche <bvanassche-HInyCGIudOg@public.gmane.org>
To: Sagi Grimberg
	<sagig-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>,
	open-iscsi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org,
	Hannes Reinecke <hare-l3A5Bk7waGM@public.gmane.org>,
	lsf-pc-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org
Cc: linux-scsi <linux-scsi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	target-devel
	<target-devel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Oren Duer <oren-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
	Or Gerlitz <ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Subject: Re: [LSF/MM TOPIC] iSCSI MQ adoption via MCS discussion
Date: Thu, 08 Jan 2015 15:11:28 +0100	[thread overview]
Message-ID: <54AE9010.5080609@acm.org> (raw)
In-Reply-To: <54AE8A02.1030100-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>

On 01/08/15 14:45, Sagi Grimberg wrote:
> Actually I started with that approach, but the independent connections
> under a single session (I-T-Nexus) violates the command ordering
> requirement. Plus, such a solution is specific to iSER...

Hello Sagi,

Which command ordering requirement are you referring to ? The Linux 
storage stack does not guarantee that block layer or SCSI commands will 
be processed in the same order as these commands have been submitted.

However, it might be interesting to have a look at virtscsi_pick_vq(). I 
think the purpose of that function is to keep queueing to the same hwq 
as long as any commands are being executed. This approach avoids that if 
an application is migrated by the scheduler from one CPU to another that 
commands get reordered due to have been submitted to different hwq's. I 
don't think we already have something similar in blk-mq but this is 
something that could be discussed further.

> (we might want to leave something for LSF ;)).

Agreed :-)

Bart.

-- 
You received this message because you are subscribed to the Google Groups "open-iscsi" group.
To unsubscribe from this group and stop receiving emails from it, send an email to open-iscsi+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To post to this group, send email to open-iscsi-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
Visit this group at http://groups.google.com/group/open-iscsi.
For more options, visit https://groups.google.com/d/optout.

  parent reply	other threads:[~2015-01-08 14:11 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-07 16:25 [LSF/MM TOPIC] iSCSI MQ adoption via MCS discussion Sagi Grimberg
     [not found] ` <54AD5DDD.2090808-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2015-01-07 16:57   ` Hannes Reinecke
     [not found]     ` <54AD6563.4040603-l3A5Bk7waGM@public.gmane.org>
2015-01-07 21:39       ` Mike Christie
2015-01-08  7:50         ` Bart Van Assche
2015-01-08 13:45           ` Sagi Grimberg
     [not found]             ` <54AE8A02.1030100-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2015-01-08 14:11               ` Bart Van Assche [this message]
     [not found]                 ` <54AE9010.5080609-HInyCGIudOg@public.gmane.org>
2015-01-08 15:57                   ` Paul Koning
2015-01-09 11:39                 ` Sagi Grimberg
2015-01-09 13:31                   ` Bart Van Assche
     [not found]                     ` <5EE87F5E6631894E80EB1A63198F964D040A6A8F-cXZ6iGhjG0hm/BozF5lIdDJ2aSJ780jGSxCzGc5ayCJWk0Htik3J/w@public.gmane.org>
2015-01-11  9:52                       ` Sagi Grimberg
2015-01-14  4:16             ` Vladislav Bolkhovitin
2015-01-08 22:16           ` Nicholas A. Bellinger
2015-01-08 22:29             ` James Bottomley
2015-01-08 22:57               ` Nicholas A. Bellinger
     [not found]                 ` <1420757822.2842.39.camel-XoQW25Eq2zviZyQQd+hFbcojREIfoBdhmpATvIKMPHk@public.gmane.org>
2015-01-08 23:22                   ` [Lsf-pc] " James Bottomley
2015-01-09  5:03                     ` Nicholas A. Bellinger
2015-01-09  6:25                       ` James Bottomley
     [not found]                       ` <1420779808.21830.21.camel-XoQW25Eq2zviZyQQd+hFbcojREIfoBdhmpATvIKMPHk@public.gmane.org>
2015-01-09 18:00                         ` Michael Christie
2015-01-09 18:28                           ` Hannes Reinecke
     [not found]                             ` <54B01DBD.5020707-l3A5Bk7waGM@public.gmane.org>
2015-01-09 18:34                               ` James Bottomley
2015-01-09 20:19                               ` Mike Christie
     [not found]                                 ` <54B037BF.1010903-hcNo3dDEHLuVc3sceRu5cw@public.gmane.org>
2015-01-11  9:40                                   ` Sagi Grimberg
2015-01-12 12:56                                     ` Bart Van Assche
     [not found]                                       ` <54B3C47E.6010109-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
2015-01-13  9:46                                         ` Sagi Grimberg
     [not found]                                     ` <54B24501.7090801-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2015-01-12 20:14                                       ` Mike Christie
     [not found]                           ` <38CE4ECA-D155-4BF9-9D6D-E1A01ADA05E4-hcNo3dDEHLuVc3sceRu5cw@public.gmane.org>
2015-01-11  9:23                             ` Sagi Grimberg
     [not found]                               ` <54B24117.7050204-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>
2015-01-12 20:05                                 ` Mike Christie
     [not found]                                   ` <54B428F2.2010507-hcNo3dDEHLuVc3sceRu5cw@public.gmane.org>
2015-01-13  9:55                                     ` Sagi Grimberg
2015-01-08 23:26                 ` Mike Christie
     [not found]                   ` <54AF122C.9070703-hcNo3dDEHLuVc3sceRu5cw@public.gmane.org>
2015-01-09 11:17                     ` Sagi Grimberg
2015-01-08 23:01           ` Mike Christie
2015-01-08 14:50         ` James Bottomley
2015-01-08 17:25           ` Sagi Grimberg
     [not found]         ` <54ADA777.6090801-hcNo3dDEHLuVc3sceRu5cw@public.gmane.org>
2015-01-08 23:40           ` Mike Christie
2015-01-07 17:22   ` Lee Duncan
2015-01-07 19:11     ` [Lsf-pc] " Jan Kara
2015-01-07 16:58 ` Nicholas A. Bellinger

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=54AE9010.5080609@acm.org \
    --to=bvanassche-hinycgiudog@public.gmane.org \
    --cc=hare-l3A5Bk7waGM@public.gmane.org \
    --cc=linux-scsi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
    --cc=lsf-pc-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org \
    --cc=ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org \
    --cc=open-iscsi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org \
    --cc=oren-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org \
    --cc=sagig-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org \
    --cc=target-devel-u79uwXL29TY76Z2rM5mHXA@public.gmane.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.