Re: [Xen-users] GPLPV xennet bsod when vcpu>15

[Dion Kant <g.w.kant@xxxxxxxxxx>]

On 06/25/2012 08:24 AM, Dion Kant wrote:
> 1. First I am going to capture the details of the first mentioned BSOD;
When vcpus=16 (yes already at 16) a reproducable BSOD occurs at startup.
De BSOD mentions:

xennet.sys
PAGE_FAULT_IN_NONPAGED_AREA
STOP 0x00000050  (0xFFFFFA8153977000,....

> 2. I'll repeat the 2 times GPLPV-ed domU multi core configuration and
> repeat the measurements.

Xen version 4.1.2_16-1.7.1
FV DomU A: GPLPV-ed Windows Server 2008 R2 Enterprise 64b, 32GB
FV DomU: GPLPV-ed Windows Server 2008 R2 Enterprise 64b, 32GB
PV DomU: openSUSE 12.1 Kernel 3.1.9-1.4-xen
Dom0: openSUSE 12.1 Kernel 3.1.9-1.4-xen
NV (Non Virtual) host connected via 1GbE

Test: transfer large file from DomU A (=server) to client.
FV: Use Windows Explorer and copy file from share
PV, Dom0, NV: Use smbclient and copy file to /dev/null

Client  Speed  client server
        (MB/s) vcpus  vcpus
 FV      105      1     8
 PV      298     32     8
 Dom0    448     64     8
 NV      114      2     8
 FV      105      1     1
 PV       70     32     1
 Dom0    166     64     1
 NV      114      2     1
 
Client  Speed   client server
        (MB/s)  vcpus  vcpus
 FV      105      1      8
 FV       88      2      8
 FV      105      4      8
 FV       95      8      8
 FV       95     15      8
 FV       55     15      1
 FV       55      1      1

No cpu pinning was configured. There is a lot of cpu load on the FV
client. The cpu load increases with increasing number of cpus (i.e.
total cycles consumed on all cpus) whereas the performance is not
increased. Spinning cpu bounces from one to the other but now and then
the (Windows) load approaches 100% (i.e. all cpus are spinning) On the
server the load is much less and sticks much more to one cpu. There is a
lot of variance between runs, so given figures are typical.

Dion

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