Hello, I got your contact info on http://bcache.evilpiepirate.org. I'm an engineer at Micron and I'm doing some basic benchmark testing with a fast SSD using bcache, and I got some performance numbers. I wonder if these numbers make sense to you. They seem to be a bit lower than I would expect. Please let me know if you want more data regarding my bcache setup, or if you don't care to (so I won't bother again). ============================================================================== System: Dell T620, 24 cores, 32GB, CentOS 7 (kernel 3.14.37) Configuration: HDD partition size 400GG, SSD partition size 100GB (relatively large cache) # fio 2.1.10, randrw 77/23, qdepth 32, runtime 3600 secs HDD SSD %diff bcache %hit %gain ======== ========= ======= ======= ===== ====== Read: 877 54,557 6120.87 1,914 5.61 118.24 Write: 292 18,188 6128.77 638 118.49 (iosp) (iops) (iops) # mysql sysbench oltp, 32 threads, database size 250GB, runtime 3600 secs HDD SSD %diff bcache %hit %gain ======== ========= ======= ======= ===== ====== rwps: 2,031.88 34,669.11 1606.26 3,066.26 19.65 50.91 tps: 112.88 1,926.06 1606.29% 170.35 50.91 # mysql sysbench oltp, 32 threads, database size 250GB, runtime 36000 secs (10 hours) HDD SSD %diff bcache %hit %gain ======== ========= ======= ======== ===== ====== rwps: 1,799.54 30,346.50 1586.35 1,862.07 31.50 3.47 tps: 99.97 1,685.92 1586.43 103.45 3.48 ============================================================================= Thank you in advance for any feedback. Deyoung Hong Linux Engineer -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
