linux-kernel - Re: [PATCH V5 4/5] virtio-scsi: introduce multiqueue support

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Date:	Tue, 19 Mar 2013 18:46:57 -0700
From:	Venkatesh Srinivas <venkateshs@...gle.com>
To:	Wanlong Gao <gaowanlong@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	linux-scsi@...r.kernel.org, mst@...hat.com,
	JBottomley@...allels.com,
	virtualization@...ts.linux-foundation.org, pbonzini@...hat.com,
	vsrinivas@...101.org, digitaleric@...gle.com, mikew@...gle.com
Subject: Re: [PATCH V5 4/5] virtio-scsi: introduce multiqueue support

This looks pretty good!

I rather like the (lack of) locking in I/O completion (around the req
count vs. target/queue binding). It is unfortunate that you need to 
hold the per-target lock in virtscsi_pick_vq() though; have any idea
how much that lock hurts?

Just two minor comments:

(in struct virtio_scsi_target_data):
+       /* This spinlock never help at the same time as vq_lock. */
                                ^^^^ held?

(in struct virtio_scsi):
+       /* Does the affinity hint is set for virtqueues? */
Could you rephrase that, please?

Tested on qemu and w/ Google Compute Engine's virtio-scsi device.

Reviewed-and-tested-by: Venkatesh Srinivas <venkateshs@...gle.com>

Thanks,
-- vs;
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