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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 4/23/2025 12:52 AM, Ankur Arora wrote: > > Raghavendra K T writes: [...] >> >> SUT: AMD EPYC 9B24 (Genoa) preempt=lazy >> >> metric = time taken in sec (lower is better). total SIZE=64GB >> mm/folio_zero_user x86/folio_zero_user change >> pg-sz=1GB 2.47044 +- 0.38% 1.060877 +- 0.07% 57.06 >> pg-sz=2MB 5.098403 +- 0.01% 2.52015 +- 0.36% 50.57 > > > Just to translate it into the same units I was using above: > > mm/folio_zero_user x86/folio_zero_user > pg-sz=1GB 25.91 GBps +- 0.38% 60.37 GBps +- 0.07% > pg-sz=2MB 12.57 GBps +- 0.01% 25.39 GBps +- 0.36% > > That's a decent improvement over Milan. Btw, are you using boost=1? > yes boost=1 > Also, any idea why the huge delta in the mm/folio_zero_user 2MB, 1GB > cases? Both of these are doing 4k page at a time, so the huge delta > is a little head scratching. > > There's a gap on Milan as well but it is much smaller. > Need to think/analyze further, but from perf stat I see glaring difference in: 2M 1G pagefaults 32,906 202 iTLB-load-misses 44,490 156 - Raghu