From: Paolo Bonzini <pbonzini@redhat.com>
To: Ming Lei <ming.lei@canonical.com>,
"James E.J. Bottomley" <JBottomley@parallels.com>
Cc: linux-scsi@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
Wanlong Gao <gaowanlong@cn.fujitsu.com>,
Rusty Russell <rusty@rustcorp.com.au>
Subject: Re: [PATCH] virtio-scsi: replace target spinlock with seqcount
Date: Fri, 23 May 2014 15:59:52 +0200 [thread overview]
Message-ID: <537F5458.6010008@redhat.com> (raw)
In-Reply-To: <1400851712-26731-1-git-send-email-ming.lei@canonical.com>
Il 23/05/2014 15:28, Ming Lei ha scritto:
> The spinlock of tgt_lock is only for serializing read and write
> req_vq, one lockless seqcount is enough for the purpose.
>
> On one 16core VM with vhost-scsi backend, the patch can improve
> IOPS with 3% on random read test.
Nice. :) The patch looks good, thanks for working this out!
James, I have a couple more patches planned for virtio-scsi, so I'll
send out the update next week.
Paolo
next prev parent reply other threads:[~2014-05-23 14:00 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-23 13:28 [PATCH] virtio-scsi: replace target spinlock with seqcount Ming Lei
2014-05-23 13:59 ` Paolo Bonzini [this message]
-- strict thread matches above, loose matches on Subject: below --
2014-05-27 16:50 Venkatesh Srinivas
2014-05-27 16:57 ` Paolo Bonzini
2014-05-28 1:48 ` Ming Lei
2014-05-28 8:52 ` Paolo Bonzini
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