Re: [PATCH 0/15] KVM: optimize for MMIO handled

From: Xiao Guangrong
Date: Wed Jun 08 2011 - 01:14:12 EST

On 06/08/2011 11:47 AM, Takuya Yoshikawa wrote:

>>> Sure, KVM guest is the client, and it uses e1000 NIC, and uses NAT
>>> network connect to the netperf server, the bandwidth of our network
>>> is 100M.
>>>
>
> I see the reason, thank you!
>
> I used virtio-net and you used e1000.
> You are using e1000 to see the MMIO performance change, right?
>

Hi Takuya,

Please applied my fix path when you test it again, thanks! :-)
(http://www.spinics.net/lists/kvm/msg56017.html)

Just then, in order to affirm the performance result, i tested it again,
and do not use our office network(since such many boxes in this network),
just boot two guests, one runs netperf server, one runs netperf client,
both use e1000 and NAT network.

I'll test the performance of virtio-net!

This is the result:

ept = 1:
============================
Before patch:
--------------
TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.122.247 (192.168.122.247) port 0 AF_INET
Local /Remote
Socket Size Request Resp. Elapsed Trans.
Send Recv Size Size Time Rate
bytes Bytes bytes bytes secs. per sec

16384 87380 1 1 60.00 1182.27
16384 87380

TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.122.247 (192.168.122.247) port 0 AF_INET
Local /Remote
Socket Size Request Resp. Elapsed Trans.
Send Recv Size Size Time Rate
bytes Bytes bytes bytes secs. per sec

16384 87380 1 1 60.00 1185.84
16384 87380

TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.122.247 (192.168.122.247) port 0 AF_INET
Local /Remote
Socket Size Request Resp. Elapsed Trans.
Send Recv Size Size Time Rate
bytes Bytes bytes bytes secs. per sec

16384 87380 1 1 60.00 1181.58
16384 87380

After patch:
--------------
TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.122.247 (192.168.122.247) port 0 AF_INET
Local /Remote
Socket Size Request Resp. Elapsed Trans.
Send Recv Size Size Time Rate
bytes Bytes bytes bytes secs. per sec

16384 87380 1 1 60.00 1205.65
16384 87380

TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.122.247 (192.168.122.247) port 0 AF_INET
Local /Remote
Socket Size Request Resp. Elapsed Trans.
Send Recv Size Size Time Rate
bytes Bytes bytes bytes secs. per sec

16384 87380 1 1 60.00 1216.06
16384 87380

TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.122.247 (192.168.122.247) port 0 AF_INET
Local /Remote
Socket Size Request Resp. Elapsed Trans.
Send Recv Size Size Time Rate
bytes Bytes bytes bytes secs. per sec

16384 87380 1 1 60.00 1215.70
16384 87380


ept = 0, bypass_guest_pf=0:
============================
Before patch:
--------------
TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.122.247 (192.168.122.247) port 0 AF_INET
Local /Remote
Socket Size Request Resp. Elapsed Trans.
Send Recv Size Size Time Rate
bytes Bytes bytes bytes secs. per sec

16384 87380 1 1 60.00 1169.70
16384 87380

TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.122.247 (192.168.122.247) port 0 AF_INET
Local /Remote
Socket Size Request Resp. Elapsed Trans.
Send Recv Size Size Time Rate
bytes Bytes bytes bytes secs. per sec

16384 87380 1 1 60.00 1160.82
16384 87380

TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.122.247 (192.168.122.247) port 0 AF_INET
Local /Remote
Socket Size Request Resp. Elapsed Trans.
Send Recv Size Size Time Rate
bytes Bytes bytes bytes secs. per sec

16384 87380 1 1 60.00 1168.01
16384 87380

After patch:
--------------
TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.122.247 (192.168.122.247) port 0 AF_INET
Local /Remote
Socket Size Request Resp. Elapsed Trans.
Send Recv Size Size Time Rate
bytes Bytes bytes bytes secs. per sec

16384 87380 1 1 60.00 1266.28
16384 87380

TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.122.247 (192.168.122.247) port 0 AF_INET
Local /Remote
Socket Size Request Resp. Elapsed Trans.
Send Recv Size Size Time Rate
bytes Bytes bytes bytes secs. per sec

16384 87380 1 1 60.00 1268.16

TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.122.247 (192.168.122.247) port 0 AF_INET
Local /Remote
Socket Size Request Resp. Elapsed Trans.
Send Recv Size Size Time Rate
bytes Bytes bytes bytes secs. per sec

16384 87380 1 1 60.00 1267.18
16384 87380


To my surprise is: after patch, the performance of ept = 0, bypass_guest_pf=0 is better than
the performance of ept = 1, maybe it is because MMIO is too much in network guests :-)
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