On Sun, Feb 14, 2010 at 6:12 PM, Joshua Boyd <boy...@jbip.net> wrote:
> > > On Sun, Feb 14, 2010 at 5:58 PM, Jonathan Belson <j...@witchspace.com>wrote: > >> On 14 Feb 2010, at 21:15, Joshua Boyd wrote: >> >> > Repeated the same tests on my AMD64 dual core 4GB system with 5 HD103SI >> 1T >> > drives in raidz1 on a Supermicro PCI-E controller, running 8-STABLE. >> >> [ snip results ] >> >> I was hoping I'd get something closer to these figures... >> >> > Here are my relevant settings: >> > >> > vfs.zfs.prefetch_disable=0 >> > vfs.zfs.zil_disable="1" >> >> I already had prefetch disabled, but retrying with zil disabled made no >> difference. >> > > That setting actually enables prefetch ... I have 4GB of RAM, so I felt > safe turning it on. > > >> >> What is your arc_min and arc_max set to? >> > > System Memory: > Physical RAM: 4015 MB > Free Memory : 2130 MB > > ARC Size: > Current Size: 783 MB (arcsize) > Target Size (Adaptive): 783 MB (c) > Min Size (Hard Limit): 101 MB (zfs_arc_min) > Max Size (Hard Limit): 808 MB (zfs_arc_max) > > ARC Size Breakdown: > Most Recently Used Cache Size: 97% 764 MB (p) > Most Frequently Used Cache Size: 2% 18 MB (c-p) > > ARC Efficency: > Cache Access Total: 148383 > Cache Hit Ratio: 66% 98434 [Defined State for buffer] > Cache Miss Ratio: 33% 49949 [Undefined State for Buffer] > REAL Hit Ratio: 65% 96744 [MRU/MFU Hits Only] > > Data Demand Efficiency: 99% > Data Prefetch Efficiency: 0% > > CACHE HITS BY CACHE LIST: > Anon: 1% 1515 [ New > Customer, First Cache Hit ] > Most Recently Used: 28% 27931 (mru) [ Return > Customer ] > Most Frequently Used: 69% 68813 (mfu) [ Frequent > Customer ] > Most Recently Used Ghost: 0% 175 (mru_ghost) [ Return > Customer Evicted, Now Back ] > Most Frequently Used Ghost: 0% 0 (mfu_ghost) [ Frequent > Customer Evicted, Now Back ] > CACHE HITS BY DATA TYPE: > Demand Data: 12% 12369 > Prefetch Data: 0% 0 > Demand Metadata: 85% 84375 > Prefetch Metadata: 1% 1690 > CACHE MISSES BY DATA TYPE: > Demand Data: 0% 6 > Prefetch Data: 96% 47994 > Demand Metadata: 3% 1580 > Prefetch Metadata: 0% 369 > --------------------------------------------- > > > >> >> > >> > On Sun, Feb 14, 2010 at 3:34 PM, Michael Loftis <mlof...@wgops.com> >> wrote: >> >>> >> >> You really need to test with at least 4GB of data, else you're just >> testing >> >> caching speeds on writing. Use a test suite like bonnie++ and you'll >> see >> >> I'd expect to get more than 4MB/s if I was just measuring cache speed :-) >> >> Cheers, >> >> --Jon >> >> > > > -- > Joshua Boyd > JBipNet > > E-mail: boy...@jbip.net > > http://www.jbip.net > -- Joshua Boyd JBipNet E-mail: boy...@jbip.net http://www.jbip.net _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
