From: Badari Pulavarty <pbadari@us.ibm.com>
To: Liu Yuan <namei.unix@gmail.com>
Cc: Stefan Hajnoczi <stefanha@gmail.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
Rusty Russell <rusty@rustcorp.com.au>,
Avi Kivity <avi@redhat.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Khoa Huynh <khoa@us.ibm.com>
Subject: Re: [RFC PATCH]vhost-blk: In-kernel accelerator for virtio block device
Date: Sun, 07 Aug 2011 22:04:50 -0700 [thread overview]
Message-ID: <4E3F6E72.1000907@us.ibm.com> (raw)
In-Reply-To: <4E3F3D4E.70104@gmail.com>
On 8/7/2011 6:35 PM, Liu Yuan wrote:
> On 08/06/2011 02:02 AM, Badari Pulavarty wrote:
>> On 8/5/2011 4:04 AM, Liu Yuan wrote:
>>> On 08/05/2011 05:58 AM, Badari Pulavarty wrote:
>>>> Hi Liu Yuan,
>>>>
>>>> I started testing your patches. I applied your kernel patch to 3.0
>>>> and applied QEMU to latest git.
>>>>
>>>> I passed 6 blockdevices from the host to guest (4 vcpu, 4GB RAM).
>>>> I ran simple "dd" read tests from the guest on all block devices
>>>> (with various blocksizes, iflag=direct).
>>>>
>>>> Unfortunately, system doesn't stay up. I immediately get into
>>>> panic on the host. I didn't get time to debug the problem. Wondering
>>>> if you have seen this issue before and/or you have new patchset
>>>> to try ?
>>>>
>>>> Let me know.
>>>>
>>>> Thanks,
>>>> Badari
>>>>
>>>
>>> Okay, it is actually a bug pointed out by MST on the other thread,
>>> that it needs a mutex for completion thread.
>>>
>>> Now would you please this attachment?This patch only applies to
>>> kernel part, on top of v1 kernel patch.
>>>
>>> This patch mainly moves completion thread into vhost thread as a
>>> function. As a result, both requests submitting and completion
>>> signalling is in the same thread.
>>>
>>> Yuan
>>
>> Unfortunately, "dd" tests (4 out of 6) in the guest hung. I see
>> following messages
>>
>> virtio_blk virtio2: requests: id 0 is not a head !
>> virtio_blk virtio3: requests: id 1 is not a head !
>> virtio_blk virtio5: requests: id 1 is not a head !
>> virtio_blk virtio1: requests: id 1 is not a head !
>>
>> I still see host panics. I will collect the host panic and see if its
>> still same or not.
>>
>> Thanks,
>> Badari
>>
>>
> Would you please show me how to reproduce it step by step? I tried dd
> with two block device attached, but didn't get hung nor panic.
>
> Yuan
I did 6 "dd"s on 6 block devices..
dd if=/dev/vdb of=/dev/null bs=1M iflag=direct &
dd if=/dev/vdc of=/dev/null bs=1M iflag=direct &
dd if=/dev/vdd of=/dev/null bs=1M iflag=direct &
dd if=/dev/vde of=/dev/null bs=1M iflag=direct &
dd if=/dev/vdf of=/dev/null bs=1M iflag=direct &
dd if=/dev/vdg of=/dev/null bs=1M iflag=direct &
I can reproduce the problem with in 3 minutes :(
Thanks,
Badari
next prev parent reply other threads:[~2011-08-08 5:06 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-28 14:29 [RFC PATCH]vhost-blk: In-kernel accelerator for virtio block device Liu Yuan
2011-07-28 14:29 ` [RFC PATCH] vhost-blk: An in-kernel accelerator for virtio-blk Liu Yuan
2011-07-28 14:47 ` Christoph Hellwig
2011-07-29 11:19 ` Liu Yuan
2011-07-28 15:18 ` Stefan Hajnoczi
2011-07-28 15:22 ` Michael S. Tsirkin
2011-07-29 15:09 ` Liu Yuan
2011-08-01 6:25 ` Liu Yuan
2011-08-01 8:12 ` Michael S. Tsirkin
2011-08-01 8:55 ` Liu Yuan
2011-08-01 10:26 ` Michael S. Tsirkin
2011-08-11 19:59 ` Dongsu Park
2011-08-12 8:56 ` Alan Cox
2011-07-28 14:29 ` [RFC PATCH] vhost: Enable vhost-blk support Liu Yuan
2011-07-28 15:44 ` [RFC PATCH]vhost-blk: In-kernel accelerator for virtio block device Stefan Hajnoczi
2011-07-29 4:48 ` Stefan Hajnoczi
2011-07-29 7:59 ` Liu Yuan
2011-07-29 10:55 ` Christoph Hellwig
2011-07-29 7:22 ` Liu Yuan
2011-07-29 9:06 ` Stefan Hajnoczi
2011-07-29 12:01 ` Liu Yuan
2011-07-29 12:29 ` Stefan Hajnoczi
2011-07-29 12:50 ` Stefan Hajnoczi
2011-07-29 14:45 ` Liu Yuan
2011-07-29 14:50 ` Liu Yuan
2011-07-29 15:25 ` Sasha Levin
2011-08-01 8:17 ` Avi Kivity
2011-08-01 9:18 ` Liu Yuan
2011-08-01 9:37 ` Avi Kivity
2011-07-29 18:12 ` Badari Pulavarty
2011-08-01 5:46 ` Liu Yuan
2011-08-01 8:12 ` Christoph Hellwig
2011-08-04 21:58 ` Badari Pulavarty
2011-08-05 7:56 ` Liu Yuan
2011-08-05 11:04 ` Liu Yuan
2011-08-05 18:02 ` Badari Pulavarty
2011-08-08 1:35 ` Liu Yuan
2011-08-08 5:04 ` Badari Pulavarty [this message]
2011-08-08 7:31 ` Liu Yuan
2011-08-08 17:16 ` Badari Pulavarty
2011-08-10 2:19 ` Liu Yuan
2011-08-10 20:37 ` Badari Pulavarty
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