Messages in this thread | | | Date | Wed, 22 Jan 2014 17:50:31 -0800 (PST) | Subject | Re: [PATCH net-next v5 0/9] xen-netback: TX grant mapping with SKBTX_DEV_ZEROCOPY instead of copy | From | David Miller <> |
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From: Zoltan Kiss <zoltan.kiss@citrix.com> Date: Mon, 20 Jan 2014 21:24:20 +0000
> A long known problem of the upstream netback implementation that on the TX > path (from guest to Dom0) it copies the whole packet from guest memory into > Dom0. That simply became a bottleneck with 10Gb NICs, and generally it's a > huge perfomance penalty. The classic kernel version of netback used grant > mapping, and to get notified when the page can be unmapped, it used page > destructors. Unfortunately that destructor is not an upstreamable solution. > Ian Campbell's skb fragment destructor patch series [1] tried to solve this > problem, however it seems to be very invasive on the network stack's code, > and therefore haven't progressed very well. > This patch series use SKBTX_DEV_ZEROCOPY flags to tell the stack it needs to > know when the skb is freed up.
This series does not apply to net-next due to some other recent changes.
Please respin, thanks.
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