Re: [Xen-users] Xen 4.0.0 - tapdisk2 "hangs"

["Fajar A. Nugraha" <fajar@xxxxxxxxx>]

On Thu, May 6, 2010 at 1:02 AM, Andrew Lyon <andrew.lyon@xxxxxxxxx> wrote:
> On Tue, May 4, 2010 at 2:09 PM, Heiko Wundram <modelnine@xxxxxxxxxxxxx> wrote:
>> It seems that after a while of heavy I/O in the virtual domain, the
>> communication between the (paravirtualized) DomU and Dom0 (the
>> tapdisk2-process) breaks

>> I've not been able to provoke this breakage by "normal" I/O (i.e., when the
>> hosts run normally), but I have been able to provoke it by using bonnie,
>> which after a short period of substained read/write I/O of +120MB/s will
>> freeze the blktap2 device.

> I have had exactly the same problem and ended up going back to tapdisk1.
>

That's odd. I don't have that behavior (only tested with bonnie++ on
PV domU). Then again, my throughput maxed about 35MB/s, which might
not be big enough to trigger the bug.

> I was able to replicate the problem using the entire SLE11-SP1 kernel
> source patch set which proves that the bug exists upstream,
> unfortunately I am very busy on other projects at the moment so did
> not have time to debug it at all.
>
> The SLE11-SP1 tree has been updated since xen-sources-2.6.32-r1, I
> will make a updated set of patches for you to try but it will take me
> a couple of days.

Thanks. We'll be waiting :D

-- 
Fajar

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