On Fri, Mar 28, 2014 at 6:06 PM, Jorgen Lundman <[email protected]> wrote:
> >> I don't know enough about these tests to make any real definitive >> statements, but the results show HFS peaking around 2GB/sec, and ZFS >> peaking around 6GB/s. Sounds good to me, though it's perplexing that >> throughput goes down as file size goes up. --matt >> >> >> >> Yes, I'm not entirely sure what is going on, but basically just using > time to check how long a iozone -A takes to run: > > hfs# time iozone -A > real 6m52.913s > > zfs# time iozone -A > real 17m2.767s > > > Pulling out the end data, randomly: > Output is in Kbytes/sec > KB reclen write rewrite read reread > > hfs: > 524288 4 50259 57859 498526 677862 > 524288 8 69938 72726 596500 888537 > 524288 16 70807 77607 778664 942680 > 524288 32 80059 64811 1131027 1142847 > 524288 64 64146 76311 1150897 1135341 > 524288 128 64722 76543 1188676 1220951 > 524288 256 61233 64857 1234472 1272219 > 524288 512 59642 66703 1216507 1196796 > 524288 1024 64701 57436 1095813 1061215 > 524288 2048 89257 71440 1011559 997499 > 524288 4096 59390 62918 816415 814473 > 524288 8192 70201 61838 807098 816163 > 524288 16384 55456 62131 770388 675465 > > zfs: > 524288 4 69946 61442 35812 33750 > 524288 8 79214 59965 35276 34657 > 524288 16 79565 61427 37954 37884 > 524288 32 78144 58469 35089 39305 > 524288 64 79383 62301 33978 38365 > 524288 128 78349 63518 35415 37586 > 524288 256 79343 64975 38946 35096 > 524288 512 76837 65248 36305 37858 > 524288 1024 80828 65693 35733 36306 > 524288 2048 78684 64832 35045 34183 > 524288 4096 74112 60109 37463 35811 > 524288 8192 78958 61731 31899 45881 > 524288 16384 77999 61969 40890 44041 > > Which would imply my read and reread values are pretty poor. flatlined > around 30MB/s, when hfs is over 1GB/s. Is it possible that the reads from HFS are cached in memory, and the ZFS reads are coming from disk? --matt > > > > > _______________________________________________ > developer mailing list > [email protected] > http://lists.open-zfs.org/mailman/listinfo/developer >
_______________________________________________ developer mailing list [email protected] http://lists.open-zfs.org/mailman/listinfo/developer
