From: Bart Van Assche <bvanassche@acm.org>
To: "Nicholas A. Bellinger" <nab@linux-iscsi.org>
Cc: Jens Axboe <axboe@kernel.dk>,
Anthony Liguori <aliguori@us.ibm.com>,
kvm-devel <kvm@vger.kernel.org>,
linux-scsi <linux-scsi@vger.kernel.org>,
"Michael S. Tsirkin" <mst@redhat.com>,
lf-virt <virtualization@lists.linux-foundation.org>,
Anthony Liguori <aliguori@linux.vnet.ibm.com>,
target-devel <target-devel@vger.kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Zhi Yong Wu <wuzhy@cn.ibm.com>, Christoph Hellwig <hch@lst.de>,
Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Subject: Re: [PATCH 0/6] tcm_vhost/virtio-scsi WIP code for-3.6
Date: Thu, 05 Jul 2012 19:57:37 +0000 [thread overview]
Message-ID: <4FF5F1B1.8030702@acm.org> (raw)
In-Reply-To: <4FF5D494.2090707@acm.org>
On 07/05/12 17:53, Bart Van Assche wrote:
> On 07/05/12 01:52, Nicholas A. Bellinger wrote:
>> fio randrw workload | virtio-scsi-raw | virtio-scsi+tcm_vhost | bare-metal raw block
>> ------------------------------------------------------------------------------------
>> 25 Write / 75 Read | ~15K | ~45K | ~70K
>> 75 Write / 25 Read | ~20K | ~55K | ~60K
>
> These numbers are interesting. To me these numbers mean that there is a
> huge performance bottleneck in the virtio-scsi-raw storage path. Why is
> the virtio-scsi-raw bandwidth only one third of the bare-metal raw block
> bandwidth ?
(replying to my own e-mail)
Or maybe the above numbers mean that in the virtio-scsi-raw test I/O was
serialized (I/O depth 1) while the other two tests use a large I/O depth
(64) ? It can't be a coincidence that the virtio-scsi-raw results are
close to the bare-metal results for I/O depth 1.
Another question: which functionality does tcm_vhost provide that is not
yet provided by the SCSI emulation code in qemu + tcm_loop ?
Bart.
next prev parent reply other threads:[~2012-07-05 19:57 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1341375846-27882-1-git-send-email-nab@linux-iscsi.org>
2012-07-04 4:24 ` [PATCH 1/6] vhost: Separate vhost-net features from vhost features Nicholas A. Bellinger
2012-07-04 4:41 ` Asias He
2012-07-04 4:24 ` [PATCH 2/6] vhost: make vhost work queue visible Nicholas A. Bellinger
2012-07-04 4:24 ` [PATCH 3/6] vhost: Add vhost_scsi specific defines Nicholas A. Bellinger
2012-07-04 4:24 ` [PATCH 4/6] tcm_vhost: Initial merge for vhost level target fabric driver Nicholas A. Bellinger
2012-07-04 4:24 ` [PATCH 5/6] virtio-scsi: Add vdrv->scan for post VIRTIO_CONFIG_S_DRIVER_OK LUN scanning Nicholas A. Bellinger
2012-07-04 4:24 ` [PATCH 6/6] virtio-scsi: Set shost->max_id=1 for tcm_vhost WWPNs Nicholas A. Bellinger
2012-07-04 14:02 ` [PATCH 0/6] tcm_vhost/virtio-scsi WIP code for-3.6 Michael S. Tsirkin
2012-07-04 14:52 ` Paolo Bonzini
2012-07-04 15:05 ` Michael S. Tsirkin
2012-07-04 22:12 ` Anthony Liguori
2012-07-05 1:52 ` Nicholas A. Bellinger
2012-07-05 10:22 ` Paolo Bonzini
2012-07-05 13:53 ` Michael S. Tsirkin
2012-07-05 14:06 ` Anthony Liguori
2012-07-05 14:32 ` Paolo Bonzini
2012-07-05 21:00 ` Michael S. Tsirkin
[not found] ` <4FF59F6B.2000101@us.ibm.com>
2012-07-05 14:40 ` Michael S. Tsirkin
2012-07-05 14:47 ` Paolo Bonzini
2012-07-05 17:26 ` Michael S. Tsirkin
2012-07-06 3:01 ` Nicholas A. Bellinger
[not found] ` <1341543672.23954.285.camel@haakon2.linux-iscsi.org>
[not found] ` <1341553397.3023.16.camel@dabdike.hilton.com>
2012-07-06 9:13 ` SCSI Performance regression [was Re: [PATCH 0/6] tcm_vhost/virtio-scsi WIP code for-3.6] Nicholas A. Bellinger
[not found] ` <1341582550.2941.10.camel@dabdike>
2012-07-06 18:21 ` Nicholas A. Bellinger
2012-07-06 20:30 ` [Ksummit-2012-discuss] " Christoph Lameter
[not found] ` <alpine.DEB.2.00.1207061528520.2656@router.home>
2012-07-06 22:06 ` Nicholas A. Bellinger
2012-07-06 3:38 ` [PATCH 0/6] tcm_vhost/virtio-scsi WIP code for-3.6 Nicholas A. Bellinger
2012-07-06 5:39 ` Paolo Bonzini
2012-07-05 17:53 ` Bart Van Assche
[not found] ` <4FF5D494.2090707@acm.org>
2012-07-05 19:57 ` Bart Van Assche [this message]
2012-07-10 0:29 ` Nicholas A. Bellinger
2012-07-05 2:01 ` Nicholas A. Bellinger
[not found] ` <1341453665.23954.224.camel@haakon2.linux-iscsi.org>
2012-07-05 9:31 ` Michael S. Tsirkin
2012-07-06 3:13 ` Nicholas A. Bellinger
[not found] ` <1341375846-27882-6-git-send-email-nab@linux-iscsi.org>
2012-07-04 14:50 ` [PATCH 5/6] virtio-scsi: Add vdrv->scan for post VIRTIO_CONFIG_S_DRIVER_OK LUN scanning Paolo Bonzini
[not found] ` <1341375846-27882-7-git-send-email-nab@linux-iscsi.org>
2012-07-04 14:50 ` [PATCH 6/6] virtio-scsi: Set shost->max_id=1 for tcm_vhost WWPNs Paolo Bonzini
2012-07-05 2:05 ` Nicholas A. Bellinger
2012-07-05 6:42 ` Paolo Bonzini
[not found] ` <1341375846-27882-5-git-send-email-nab@linux-iscsi.org>
2012-07-05 17:47 ` [PATCH 4/6] tcm_vhost: Initial merge for vhost level target fabric driver Bart Van Assche
[not found] ` <4FF5D31F.90404@acm.org>
2012-07-05 17:59 ` Bart Van Assche
2012-07-04 4:24 [PATCH 0/6] tcm_vhost/virtio-scsi WIP code for-3.6 Nicholas A. Bellinger
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