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Re: [Xen-users] [Xen-devel] [BUG] 16 vcpus + 2 vif bridge = issue ?

On Fri, 2015-09-25 at 10:41 +0100, Ian Campbell wrote:
> On Thu, 2015-09-24 at 23:49 +0300, Roman Shubovich wrote:
> > here is my configs and log/tcpdump/ping/dmesg output
> > i see no visible changes in all of the logs output, but 16vcpus domU
> > didn't work properly
> > 
> > 
> > and one more thing:
> > when i try to start domU with vcpus more than 16 then domU won't start
> > at
> > all
> This looks similar to an issue report on xen-users earlier in the week.
> Please check the list archives for the thread "Xen bridging issue", IIRC
> patches were proposed but I'm not sure what the status of those is.

Comparing your logs it looks like this was the issue with <=16 VCPUS too:

$ diff -u <(sed -e 's/^\[.....\.......\]\s*//g' A) <(sed -e 
's/^\[.....\.......\]\s*//g' B)
@@ -249,6 +252,8 @@
 i8042: PNP: No PS/2 controller found. Probing ports directly.
 blkfront: xvda: barrier or flush: disabled; persistent grants: enabled; 
indirect descriptors: enabled;
 xvda: unknown partition table
+xen_netfront: can't alloc rx grant refs
+net eth1: only created 15 queues
 i8042: No controller found
 mousedev: PS/2 mouse device common for all mice
 rtc_cmos rtc_cmos: rtc core: registered rtc_cmos as rtc0

It's just a bit less noisy about it in this case for some reason.


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