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Message-ID: <521116.1685091071@warthog.procyon.org.uk> Date: Fri, 26 May 2023 09:51:11 +0100 From: David Howells <dhowells@...hat.com> To: kernel test robot <oliver.sang@...el.com> Cc: dhowells@...hat.com, oe-lkp@...ts.linux.dev, lkp@...el.com, Eric Dumazet <edumazet@...gle.com>, "David S. Miller" <davem@...emloft.net>, David Ahern <dsahern@...nel.org>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Jens Axboe <axboe@...nel.dk>, Matthew Wilcox <willy@...radead.org>, netdev@...r.kernel.org, ying.huang@...el.com, feng.tang@...el.com, fengwei.yin@...el.com Subject: Re: [dhowells-fs:sendpage-1] [tcp] 77f5a42b2d: netperf.Throughput_Mbps -14.6% regression kernel test robot <oliver.sang@...el.com> wrote: > kernel test robot noticed a -14.6% regression of netperf.Throughput_Mbps on: Okay, yes, I see something similar on my test machine. Loopback throughput drops from ~32Gbit/s to ~26Gbit/s with the Convert do_tcp_sendpages patch. But! The complete set of patches is not yet fully applied. If you look at the two patches I've put on my sendpage-1 branch[1], the first brings the performance back to where it was before and the second bumps it up to ~43Gbit/s. However, I don't want to push those into the network tree until support for MSG_SPLICE_PAGES is added to all the network protocols that support splicing. I have two more patchsets in the queue and there will be a third before I can get to that point. Could you try running this branch through your tests? Thanks, David [1] https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/log/?h=sendpage-1
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