Messages in this thread | | | Date | Fri, 03 Apr 2009 17:48:33 -0400 | From | Jeff Garzik <> | Subject | Re: Linux 2.6.29 |
| |
Linus Torvalds wrote: > > On Fri, 3 Apr 2009, Jeff Garzik wrote: >> Yeah, it's a no-name SSD. >> >> I've attached 'hdparm -I' in case anyone is curious. It's from newegg.com, so >> nothing NDA'd or sekrit. > > Hmm. Does it do ok on the "random write" test? There's a few non-intel > controllers that are fine - apparently the newer samsung ones, and the one > from Indilinx. > > But I _think_ G.SKILL uses those horribly broken JMicron controllers. > Judging by your performance numbers, it's the slightly fancier double > controller version (ie basically an internal RAID0 of two identical > JMicron controllers, each handling half of the flash chips).
Quoting from the review at http://www.bit-tech.net/hardware/storage/2008/12/03/g-skill-patriot-and-intel-ssd-test/2
"Cracking the drive open reveals the PCB fitted with sixteen Samsung 840, 8GB MLC NAND flash memory modules, linked to a J-Micron JMF 602 storage controller chip."
> Try a random write test. If it's the JMicron controllers, performance will > plummet to a few tens of kilobytes per second.
Since I am hacking on osdblk currently, I was too slack to code up a test. This is what bonnie++ says, at least...
> Version 1.03c ------Sequential Output------ --Sequential Input- --Random- > -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- > Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP > bd.yyz.us 8000M 28678 6 27836 5 133246 12 5237 10 > ------Sequential Create------ --------Random Create-------- > -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- > files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP > 16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ > bd.yyz.us,8000M,,,28678,6,27836,5,,,133246,12,5236.6,10,16,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++
But I guess seeks are not very helpful on an SSD :) Any pre-built random write tests out there?
Regards,
Jeff
| |