Re: [Xen-devel][PV-ops][PATCH] Netback: Fix PV network issue fornetback multiple threads patchset

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Thu, Jun 10, 2010 at 08:51:24AM -0400, djmagee@xxxxxxxxxxxx wrote:
> I can confirm that this patch solves the problem for me.  Tested in Win7
> x64 with GPLPV 0.11.0.213, and with a PV linux domain running fedora 12
> 64bit.
> 

Good to hear. 

So I guess Jeremy can revert the revert and apply the bugfix patch :)

-- Pasi

> Doug Magee
> 
> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Xu, Dongxiao
> Sent: Thursday, June 10, 2010 7:49 AM
> To: Jeremy Fitzhardinge
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx; djmagee@xxxxxxxxxxxx;
> Pasi@xxxxxxxxxxxxxxxxxxxx; Fantu
> Subject: [Xen-devel][PV-ops][PATCH] Netback: Fix PV network issue
> fornetback multiple threads patchset
> 
> Hi Jeremy,
> 
> The attached patch should fix the PV network issue after applying the
> netback multiple threads patchset.
> 
> This bug comes from the version upgrade when resending my patchset last
> time. 
> 
> In patch v1 & v2, I used kzalloc() to allocate memory, so there is no
> problem.
> In patch v3, I changed it to "__get_free_pages(GFP_KERNEL | __GFP_ZERO,
> order)", so there is also no problem.
> However in patch v4, when modified it to vmalloc according to the
> comments, memset(0) is missing. Sorry for that.
> 
> *ONE POINT IS*, the phenomenon on my side is different from the bug
> reports from mailing list. They often saw GPLPV network long ping
> latency, and on my side, system would crash when enabling guest network.
> 
> 
> After applying the patch, network in the following cases are working
> fine in my side. 
> 
> WinXP 32bit with gplpv_XP_0.11.0.213.msi 64bit Linux PV guest.
> 64bit RHEL5u3 HVM guest with PV driver
> 
> Can somebody help to try this fixing for long ping latency phenomenon?
> Appreciate for that!
> 
> Thanks,
> Dongxiao
> 
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