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
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