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Date: Tue, 20 Aug 2013 10:33:08 +0800 From: Jason Wang <jasowang@...hat.com> To: "Michael S. Tsirkin" <mst@...hat.com> CC: kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 2/6] vhost_net: use vhost_add_used_and_signal_n() in vhost_zerocopy_signal_used() On 08/16/2013 05:54 PM, Michael S. Tsirkin wrote: > On Fri, Aug 16, 2013 at 01:16:26PM +0800, Jason Wang wrote: >> > 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 <jasowang@...hat.com> > 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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