Messages in this thread | | | Date | Sun, 07 Aug 2011 22:04:50 -0700 | From | Badari Pulavarty <> | Subject | Re: [RFC PATCH]vhost-blk: In-kernel accelerator for virtio block device |
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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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