Re: [RFC PATCH v8 00/16] Provide a zero-copy method on KVM virtio-net.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



 On 07/30/2010 01:31 AM, Shirley Ma wrote:

Our goal is to improve the bandwidth and reduce the CPU usage.
Exact performance data will be provided later.
I did some vhost performance measurement over 10Gb ixgbe, and found that
in order to get consistent BW results, netperf/netserver, qemu, vhost
threads smp affinities are required.

Looking forward to these results for small message size comparison. For
large message size 10Gb ixgbe BW already reached by doing vhost smp
affinity w/i offloading support, we will see how much CPU utilization it
can be reduced.

Please provide latency results as well. I did some experimental on
macvtap zero copy sendmsg, what I have found that get_user_pages latency
pretty high.


get_user_pages() is indeed slow.  But what about get_user_pages_fast()?

Note that when the page is first touched, get_user_pages_fast() falls back to get_user_pages(), so the latency needs to be measured after quite a bit of warm-up.

--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [KVM ARM]     [KVM ia64]     [KVM ppc]     [Virtualization Tools]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite Questions]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux