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Date: Tue, 14 Sep 2010 14:05:45 +0200 From: "Michael S. Tsirkin" <mst@...hat.com> To: Shirley Ma <mashirle@...ibm.com> Cc: Avi Kivity <avi@...hat.com>, Arnd Bergmann <arnd@...db.de>, xiaohui.xin@...el.com, netdev@...r.kernel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [RFC PATCH 0/1] macvtap TX zero copy between guest and host kernel On Mon, Sep 13, 2010 at 01:43:00PM -0700, Shirley Ma wrote: > This patch induces a new sock flag ZEROCOPY to avoid copy between > userspace and kernel. macvtap is the first user of zero copy between > guest and host kernel. It only uses when the lower device supports high > memory DMA. The first set of patch only addresses transmission TX side. > The test has shown big improvement on either CPU utilization reduction > or BW increase on 10GbE Intel NIC. Performance data will be submitted in > the coming email. > > thanks > Shirley While others pointed out correctness issues with the patch, I would still like to see the performance numbers, just so we understand what's possible. -- MST -- 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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