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a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=FzDxYMQOQF-4DHx3sykA:9 a=QEXdDO2ut3YA:10 cc=ntf awl=host:13634 X-Proofpoint-GUID: tGprvGMGy7IL0MfKLyLVkuyZ6hh1162b X-Proofpoint-ORIG-GUID: tGprvGMGy7IL0MfKLyLVkuyZ6hh1162b X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTExMDA2MSBTYWx0ZWRfX66d3UHwkzove 4zbXRoR4JWEyN4dvJU+hftieLolqvki0txftB+8TcuqaXDfZfO6S6vqXap35UT8KHkjjOKUuNrE ojNcgW8Cxy2Lem+e5oo11edjVSRZPU20b5yvNizW2b5wUJerPWVyaAcVSOgeVc+ofSzw1/2s+Vh QXeZqHZ8qJ/XOEXOVxU4jF3M9/jRnlfCj1moj4Dl6Q6+/w7ccNfkIz3BAxCFOgFK6biPzEIH9V8 rQGAgVCYkieMWUPhSr+9yRL9jDSBQjH20qL0bd2P1EZ4PS1/NmVgzWhKAkvH6Dv1AJFsbslJIG7 T4rTqbJE3eeCJWriROR74hgwGgqFTNC5uUJWQzENi0KZ4+d6R0aBK+K5zGfNe4QbV2eV9dfN/LX 5kepUoXoc6KxkiQhF+wfUG0iHgSyauXIpeyV1kTazcANbc/ue/I= On 10/11/2025 18:27, Darrick J. Wong wrote: > From: Darrick J. Wong > > We've gotten complaints about this test taking hours to run and > producing stall warning on test VMs with a large number of cpu cores. I > think this is due to the maximum atomic write unit being very large on > XFS where we can fall back to a software-based out of place write > implementation. > > On the victim machine, the atomic write max is 4MB and there are 24 > CPUs. As a result, aw_bsize to be 1MB, so the file size is > 1MB * 24 * 2 * 100 == 4.8GB. I set up a test machine with fast storage > and 24 CPUs, and the atomic writes poked along at 25MB/s and the total > runtime was 300s. On spinning rust those stats will be much worse. > > Let's try backing the file size off by 10x and see if that eases the > complaints. > The awu max for xfs is still unbounded (so the file size could still be huge). For ext4, it is limited by HW constraints - the largest HW awu max I heard about is 256KB. How about also limiting awu max to something sane, like 1MB? > Cc: # v2025.10.20 > Fixes: 9117fb93b41c38 ("generic: Add atomic write test using fio verify on file mixed mappings") > Signed-off-by: "Darrick J. Wong" > --- > tests/generic/774 | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > > diff --git a/tests/generic/774 b/tests/generic/774 > index 7a4d70167f9959..28886ed5b09ff7 100755 > --- a/tests/generic/774 > +++ b/tests/generic/774 > @@ -29,7 +29,7 @@ aw_bsize=$(_max "$awu_min_write" "$((awu_max_write/4))") > fsbsize=$(_get_block_size $SCRATCH_MNT) > > threads=$(_min "$(($(nproc) * 2 * LOAD_FACTOR))" "100") > -filesize=$((aw_bsize * threads * 100)) > +filesize=$((aw_bsize * threads * 10)) > depth=$threads > aw_io_size=$((filesize / threads)) > aw_io_inc=$aw_io_size >