Re: [Xen-devel] Perf regression of netperf compared Xen 4.4 to origin/master

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Wed, Jul 2, 2014 at 5:55 PM, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
> On 02/07/14 17:52, Konrad Rzeszutek Wilk wrote:
>> The test is pretty silly.
>>
>> I've 14 guests, and I make each guest run netperf against the other.
>> I start with 1 pair, then 2 pairs, then up to 7. Each guest
>> is 768 MB, runs in a RAMdisk and just has one vif. The box is
>> a SuperMicro X8DB8+ with two E5520 and 12GB of RAM.
>> The netperf runs for a minute. The guests are PVHVM and I am
>> using qemu-upstream.  The guest configs are:
>>
>> builder='hvm'
>> disk = [ 'file:/mnt/lab/bootstrap-x86_64/root_image.iso,hdc:cdrom,r']
>> memory=768
>> boot='d'
>> vcpus=1
>> serial='file:/var/log/xen/console-g-vm0.log'
>> vnclisten='0.0.0.0'
>> name='g-vm0'
>> on_crash='preserve'
>> # IP is 192.168.102.90
>> vif = [ 'mac=00:0f:4b:01:01:00, bridge=switch' ]
>> .. and naturally the ip, name and MAC change for each guest.
>>
>> The kernel for both the guest and domain 0 is the same - no
>> configuration change. The Xen is built without debug=y.
>
> What do you mean by this?  master has debugging enabled by default so
> unless you build with debug=n, you will have a debug build.

You don't know how many times I've tripped over this...

 -George

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