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.
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