Re: [LSF/MM/BPF TOPIC] ublk & io_uring: ublk zero copy support

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On 5/6/23 02:38, Ming Lei wrote:
On Fri, May 05, 2023 at 09:57:47PM +0000, Bernd Schubert wrote:
Hi Ming,

On 4/29/23 04:18, Ming Lei wrote:
Hello,

ublk zero copy is observed to improve big chunk(64KB+) sequential IO performance a
lot, such as, IOPS of ublk-loop over tmpfs is increased by 1~2X[1], Jens also observed
that IOPS of ublk-qcow2 can be increased by ~1X[2]. Meantime it saves memory bandwidth.

So this is one important performance improvement.

So far there are three proposal:

looks like there is no dedicated session. Could we still have a
discussion in a free slot, if possible?

Sure, and we can invite Pavel to the talk too if he is in this lsfmm.

I'd love to go but regretfully can't make it

--
Pavel Begunkov



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