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SubjectRe: [RFC PATCH]vhost-blk: In-kernel accelerator for virtio block device
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




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