linux-kernel - Re: [PATCH] virtio-blk: make the queue depth the max supportable by the hypervisor

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Message-ID: <CAHdzE-_cAndCNhBM1N0RpjQDhoh3Snas-eza4rYN33Rf69PXyw@mail.gmail.com>
Date:	Wed, 19 Mar 2014 10:48:44 -0700
From:	Venkatesh Srinivas <venkateshs@...gle.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	tytso@....edu,
	Linux Kernel Developers List <linux-kernel@...r.kernel.org>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	virtio-dev@...ts.oasis-open.org,
	virtualization@...ts.linux-foundation.org,
	Frank Swiderski <fes@...gle.com>
Subject: Re: [PATCH] virtio-blk: make the queue depth the max supportable by
 the hypervisor

> And I rewrote it substantially, mainly to take
> VIRTIO_RING_F_INDIRECT_DESC into account.
>
> As QEMU sets the vq size for PCI to 128, Venkatash's patch wouldn't
> have made a change.  This version does (since QEMU also offers
> VIRTIO_RING_F_INDIRECT_DESC.

That divide-by-2 produced the same queue depth as the prior
computation in QEMU was deliberate -- but raising it to 128 seems
pretty reasonable.

Signed-off-by: Venkatesh Srinivas <venkateshs@...gle.com>

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