Re: [RFC 00/12] io_uring zerocopy send
flat view
From: Pavel Begunkov <asml.silence@gmail.com>
Date: 2021-12-01 20:46:58
Also in:
io-uring, lkml
On 12/1/21 17:57, David Ahern wrote:
On 12/1/21 8:32 AM, Pavel Begunkov wrote:
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mileage varies quite a bit.Interesting, any brief notes on the setup and the results? DummyVM on Chromebook. I just cloned your repos, built, install and test. As mentioned above, the skb_orphan_frags_rx change is missing from your repo and that is the key to your reported performance gains.
Just to clear misunderstandings if any, all the numbers in the cover-letter were measured on the same kernel and during the same boot, and it doesn't include the skb_orphan_frags_rx() change. All double checked by looking at the traces. When it's routed through the loopback paths (e.g. -D 127.0.0.1), it's indeed slow for both msg_zerocopy and send-zc, and both "benefit" in raw throughput from the hack. -- Pavel Begunkov