Re: [PATCH v3 2/4] mm: kick writeback flusher for IOCB_DONTCACHE with targeted dirty tracking

Matthew Wilcox
2026-04-26T20:44:51Z

On Sun, Apr 26, 2026 at 07:56:08AM -0400, Jeff Layton wrote:
> Mixed-mode noisy neighbor (dontcache writer + buffered readers):
> baseline patched change
> writer (MB/s) 1297.6 1471.1 +13.4%
> readers avg (MB/s) 855.0 462.4 -45.9%

hm. This wasn't what I thought of when I thought of "noisy neighbour".
I'd have process A doing DONTCACHE writes to file A and process B doing
normal buffered writes to file B.