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Re: [Xen-users] The bottleneck of using multinetwork card?

  • To: "Fajar A. Nugraha" <fajar@xxxxxxxxx>
  • From: ma qiang <maqiang1984@xxxxxxxxx>
  • Date: Mon, 6 Sep 2010 15:26:53 +0800
  • Cc: xen-users@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Mon, 06 Sep 2010 00:28:14 -0700
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On Mon, Sep 6, 2010 at 3:12 PM, Fajar A. Nugraha <fajar@xxxxxxxxx> wrote:
On Mon, Sep 6, 2010 at 1:57 PM, ma qiang <maqiang1984@xxxxxxxxx> wrote:
> 20% is the vm's utilization of cpu, not dom0's.
> My domU is hvm and centos linux.

HVM is known to have slower disk/network I/O.
Here are some things you could check:
- look at CPU performance on both dom0 and domU using a program that
can show individual CPU load (like htop). My guess is one CPU is at
100% utilization
I'm sure none CPU is at 100% utilization.  I double confirmed that. :)
- check to see if you're already using PV drivers. If not, using it
might increase throughput. See http://pastebin.com/fb6fe631 for
example (basically you need to make sure the correct modules are
loaded while others are blacklisted)
- Try using PV domU, and compare the results.
I don't know if I have already using PV drivers, I'm going to check it. Thanks a lot.

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