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 j7US4Vl/ 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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: Namhyung Kim writes: > On Wed, Jul 09, 2025 at 05:59:19PM -0700, Ankur Arora wrote: >> There can be a significant gap in memset/memcpy performance depending >> on the size of the region being operated on. >> >> With chunk-size=4kb: >> >> $ echo madvise > /sys/kernel/mm/transparent_hugepage/enabled >> >> $ perf bench mem memset -p 4kb -k 4kb -s 4gb -l 10 -f x86-64-stosq >> # Running 'mem/memset' benchmark: >> # function 'x86-64-stosq' (movsq-based memset() in arch/x86/lib/memset_64.S) >> # Copying 4gb bytes ... >> >> 13.011655 GB/sec >> >> With chunk-size=1gb: >> >> $ echo madvise > /sys/kernel/mm/transparent_hugepage/enabled >> >> $ perf bench mem memset -p 4kb -k 1gb -s 4gb -l 10 -f x86-64-stosq >> # Running 'mem/memset' benchmark: >> # function 'x86-64-stosq' (movsq-based memset() in arch/x86/lib/memset_64.S) >> # Copying 4gb bytes ... >> >> 21.936355 GB/sec >> >> So, allow the user to specify the chunk-size. >> >> The default value is identical to the total size of the region, which >> preserves current behaviour. >> >> Signed-off-by: Ankur Arora > > Again, please update the documentation. With that, > > Reviewed-by: Namhyung Kim > Thanks! Will do. -- ankur