Re: [PATCH 2/6] vhost_net: use vhost_add_used_and_signal_n() in vhost_zerocopy_signal_used()
From: Jason Wang <hidden>
Date: 2013-08-20 02:33:14
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kvm, lkml, netdev
On 08/16/2013 05:54 PM, Michael S. Tsirkin wrote:
On Fri, Aug 16, 2013 at 01:16:26PM +0800, Jason Wang wrote:quoted
quoted
Switch to use vhost_add_used_and_signal_n() to avoid multiple calls to vhost_add_used_and_signal(). With the patch we will call at most 2 times (consider done_idx warp around) compared to N times w/o this patch. Signed-off-by: Jason Wang <redacted>So? Does this help performance then?
Looks like it can especially when guest does support event index. When guest enable tx interrupt, this can saves us some unnecessary signal to guest. I will do some test.