linux-kernel - Re: Linux 2.6.29

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Date:	Fri, 03 Apr 2009 17:48:33 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Chris Mason <chris.mason@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rees <drees76@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
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



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