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open-iscsi and multiqueue
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Erez Zilber  
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 More options Nov 4, 8:59 am
From: Erez Zilber <erezzi.l...@gmail.com>
Date: Wed, 4 Nov 2009 15:59:02 +0200
Local: Wed, Nov 4 2009 8:59 am
Subject: open-iscsi and multiqueue
Mike,

Can open-iscsi utilize the multiqueue feature
(http://lwn.net/Articles/289137/) in order to improve performance? If
yes, does it require any change in open-iscsi? Did you try to measure
the performance improvement?

Thanks,
Erez


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Mike Christie  
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 More options Nov 4, 11:01 am
From: Mike Christie <micha...@cs.wisc.edu>
Date: Wed, 04 Nov 2009 10:01:15 -0600
Local: Wed, Nov 4 2009 11:01 am
Subject: Re: open-iscsi and multiqueue

Erez Zilber wrote:
> Mike,

> Can open-iscsi utilize the multiqueue feature
> (http://lwn.net/Articles/289137/) in order to improve performance? If
> yes, does it require any change in open-iscsi? Did you try to measure
> the performance improvement?

I am not sure about any of the above :) People have been sending
questions about multi queue (there is tx multiqueue like in the link you
provided and recv multiqueue too right) and also DCB/DCBX in private and
at work, and I have only begun to start to try it out.

My initial quess was that we can take advantage of multiqueue without
any changes when using software iscsi. I thought the network layer would
handle things for us like it would any other net traffic that uses the
sendpage/sendmsg interface.

For partial offload like with cxgb3i and bnx2i, I am not sure. They both
use different interfaces into the net driver/card.


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Erez Zilber  
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 More options Nov 5, 1:53 am
From: Erez Zilber <erezzi.l...@gmail.com>
Date: Thu, 5 Nov 2009 08:53:29 +0200
Local: Thurs, Nov 5 2009 1:53 am
Subject: Re: open-iscsi and multiqueue

Thanks and another question - I understand that this feature was added
somewhere around 2.6.28. Is it already in RHEL 5.X or is it planned to
be added only in RHEL 6.0?

Thanks,
Erez


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