Re: [linus:master] [fs/pipe] f7f4665dc5: lmbench3.PIPE.bandwidth.MB/sec 18.5% regression

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From: Breno Leitao

Date: Thu Nov 05 2026 - 10:34:37 EST

On Thu, Nov 05, 2026 at 04:04:58PM +0100, Christian Brauner wrote:
> On Thu, Nov 05, 2026 at 08:38:45AM +0800, kernel test robot wrote:
> > kernel test robot noticed a 18.5% regression of lmbench3.PIPE.bandwidth.MB/sec on:
> >
> > commit: f7f4665dc520fd8bbc1db20e59945773e03744a0 ("fs/pipe: unify the page pools into a single per-pipe pool") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

> @Breno can you reproduce this?
> It's something we should at least investigate.

Ack, I will check it , but not today unfortunately.

I will come back to it tomorrow, and until end of week I will report my
findings.