lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [day] [month] [year] [list]
Date:	Sat, 19 Jan 2008 02:24:15 -0800 (PST)
From:	Martin Knoblauch <>
To:	Mike Snitzer <>,
	Linus Torvalds <>
Cc:	Mel Gorman <>, Fengguang Wu <>,
	Peter Zijlstra <>,,
	Ingo Molnar <>,,
	"" <>,
Subject: Re: regression: 100% io-wait with 2.6.24-rcX

----- Original Message ----
> From: Mike Snitzer <>
> To: Linus Torvalds <>
> Cc: Mel Gorman <>; Martin Knoblauch <>; Fengguang Wu <>; Peter Zijlstra <>;; Ingo Molnar <>;; "" <>;
> Sent: Friday, January 18, 2008 11:47:02 PM
> Subject: Re: regression: 100% io-wait with 2.6.24-rcX
> > I can fire up 2.6.24-rc8 in short order to see if things are vastly
> > improved (as Martin seems to indicate that he is happy with
> > AACRAID on 2.6.24-rc8).  Although even Martin's AACRAID
> > numbers from
 > are still quite good (relative to mine).  Martin can you share any tuning
> > you may have done to get AACRAID to where it is for you right now?

 I have always been happy with the AACRAID box compared to the CCISS system. Even with the "regression" in 2.6.24-rc1..rc5 it was more than acceptable to me. For me the differences between 2.6.19  and 2.6.24-rc8 on the AACRAID setup are:

- 11% (single stream) to 25% (dual/triple stream) regression in DIO. Something I do not care much about. I just measure it for reference.
+ the very nice behaviour when writing to different targets (mix3), which I attribute to Peter's per-dbi stuff.

 And until -rc6 I was extremely pleased with the cool speedup I saw on my CCISS boxes. This would have been the next "production" kernel for me. But lets discuss this under a seperate topic. It has nothing to do with the original wait-io issue.

 Oh, before I forget. There has been no tuning for the AACRAID. The system is an IBM x3650 with built in AACRAID and battery backed write cache. The disks are 6x142GB/15krpm in a RAID5 setup. I see one big difference between your an my tests. I do 1MB writes to simulate the behaviour of the real applications, while yours seem to be much smaller.

To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to
More majordomo info at

Powered by blists - more mailing lists