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

["Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx>]

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

Attachment: 0001-Netback-Set-allocated-memory-to-zero-from-vmalloc.patch
Description: 0001-Netback-Set-allocated-memory-to-zero-from-vmalloc.patch

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