---------- Forwarded message ---------- From: Steve French <smfrench@xxxxxxxxx> Date: Mon, May 21, 2018 at 8:28 PM Subject: rsize/wsize and Samba performance To: Jeremy Allison <jra@xxxxxxxxx>, CIFS <linux-cifs@xxxxxxxxxxxxxxx>, samba-technical <samba-technical@xxxxxxxxxxxxxxx> Any idea why Samba performance is worse with 8MB i/os than 1MB i/os for sequential read/write multiple process i/os? Performance was good ... but it surprised me that 1MB was better than 8MB The fio job file I was using was the normal fio-seq-RW # cat ~/fio/fio-seq-RW.job [global] name=fio-seq-RW filename=fio-seq-RW rw=rw rwmixread=60 rwmixwrite=40 bs=256K direct=0 numjobs=4 time_based=1 runtime=100 [file1] size=10G ioengine=libaio iodepth=16 SMB3.02 mounts to Samba rsize/wsize default (ie 1MB on Linux client) READ: bw=3098MiB/s (3249MB/s), 773MiB/s-776MiB/s (810MB/s-814MB/s), io=303GiB (325GB), run=100001-100002msec WRITE: bw=2071MiB/s (2172MB/s), 518MiB/s-518MiB/s (543MB/s-543MB/s), io=202GiB (217GB), run=100001-100002msec --------------------------------------------- rsize/wsize=8MB mount on Linux client READ: bw=2779MiB/s (2913MB/s), 692MiB/s-696MiB/s (726MB/s-730MB/s), io=271GiB (291GB), run=100001-100001msec WRITE: bw=1858MiB/s (1948MB/s), 464MiB/s-465MiB/s (487MB/s-487MB/s), io=181GiB (195GB), run=100001-100001msec NFSv3 and NFSv4.1 as expected (to kernel NFS server) were much slower than SMB3 for both read and write (presumably Samba is handling more I/Os and doing better job async - i/o sizes are now the same 1MB by default) -- Thanks, Steve -- Thanks, Steve -- To unsubscribe from this list: send the line "unsubscribe linux-cifs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
