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Date: Mon, 17 May 2010 21:08:32 -0700 (PDT) From: David Miller <davem@...emloft.net> To: mst@...hat.com Cc: quintela@...hat.com, rusty@...tcorp.com.au, paulmck@...ux.vnet.ibm.com, arnd@...db.de, kvm@...r.kernel.org, virtualization@...ts.osdl.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, alex.williamson@...hat.com, amit.shah@...hat.com Subject: Re: [PATCH] vhost-net: utilize PUBLISH_USED_IDX feature From: "Michael S. Tsirkin" <mst@...hat.com> Date: Tue, 18 May 2010 04:19:31 +0300 > With PUBLISH_USED_IDX, guest tells us which used entries > it has consumed. This can be used to reduce the number > of interrupts: after we write a used entry, if the guest has not yet > consumed the previous entry, or if the guest has already consumed the > new entry, we do not need to interrupt. > This imporves bandwidth by 30% under some workflows. > > Signed-off-by: Michael S. Tsirkin <mst@...hat.com> > --- > > Rusty, Dave, this patch depends on the patch > "virtio: put last seen used index into ring itself" > which is currently destined at Rusty's tree. > Rusty, if you are taking that one for 2.6.35, please > take this one as well. > Dave, any objections? None: Acked-by: David S. Miller <davem@...emloft.net> -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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