Messages in this thread | | | Date | Mon, 02 Sep 2013 14:28:37 +0800 | From | Jason Wang <> | Subject | Re: [PATCH V2 2/6] vhost_net: use vhost_add_used_and_signal_n() in vhost_zerocopy_signal_used() |
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On 09/02/2013 01:50 PM, Michael S. Tsirkin wrote: > On Fri, Aug 30, 2013 at 12:29:18PM +0800, Jason Wang wrote: >> > We tend to batch the used adding and signaling in vhost_zerocopy_callback() >> > which may result more than 100 used buffers to be updated in >> > vhost_zerocopy_signal_used() in some cases. So wwitch to use > switch
Ok. >> > vhost_add_used_and_signal_n() to avoid multiple calls to >> > vhost_add_used_and_signal(). Which means much more less times of used index >> > updating and memory barriers. > pls put info on perf gain in commit log too >
Sure.
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