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

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Date:	Fri, 05 Aug 2011 19:04:45 +0800
From:	Liu Yuan <namei.unix@...il.com>
To:	Badari Pulavarty <pbadari@...ibm.com>
CC:	Stefan Hajnoczi <stefanha@...il.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Avi Kivity <avi@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, Khoa Huynh <khoa@...ibm.com>
Subject: Re: [RFC PATCH]vhost-blk: In-kernel accelerator for virtio block
 device

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

View attachment "vblk-for-kernel-2.patch" of type "text/x-patch" (3506 bytes)