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From: Justin Piszcz <jpiszcz@lucidpixels.com>
To: Michael Tokarev <mjt@tls.msk.ru>
Cc: linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org,
	xfs@oss.sgi.com, Alan Piszcz <ap@solarrain.com>
Subject: Re: Kernel 2.6.19.2 New RAID 5 Bug (oops when writing Samba -> RAID5)
Date: Tue, 23 Jan 2007 08:46:48 -0500 (EST)	[thread overview]
Message-ID: <Pine.LNX.4.64.0701230846410.8978@p34.internal.lan> (raw)
In-Reply-To: <45B60403.1060201@tls.msk.ru>



On Tue, 23 Jan 2007, Michael Tokarev wrote:

> Justin Piszcz wrote:
> > 
> > On Tue, 23 Jan 2007, Michael Tokarev wrote:
> > 
> >> Disabling pre-emption on critical and/or server machines seems to be a good
> >> idea in the first place.  IMHO anyway.. ;)
> >
> > So bottom line is make sure not to use preemption on servers or else you 
> > will get weird spinlock/deadlocks on RAID devices--GOOD To know!
> 
> This is not a reason.  The reason is that preemption usually works worse
> on servers, esp. high-loaded servers - the more often you interrupt a
> (kernel) work, the more nedleess context switches you'll have, and the
> more slow the whole thing works.
> 
> Another point is that with preemption enabled, we have more chances to
> hit one or another bug somewhere.  Those bugs should be found and fixed
> for sure, but important servers/data isn't a place usually for bughunting.
> 
> /mjt
> -
> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

Thanks for the update/info.

Justin.

  reply	other threads:[~2007-01-23 13:46 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-20 12:23 Justin Piszcz
2007-01-20 12:46 ` Justin Piszcz
2007-01-22 21:01 ` Chuck Ebbert
2007-01-22 21:59   ` Neil Brown
2007-01-23  1:44     ` Dan Williams
2007-01-23  2:06       ` Neil Brown
2007-01-23 10:56     ` Justin Piszcz
2007-01-23 11:08       ` Michael Tokarev
2007-01-23 11:59         ` Justin Piszcz
2007-01-23 12:48           ` Michael Tokarev
2007-01-23 13:46             ` Justin Piszcz [this message]
2007-01-24 23:37   ` Justin Piszcz
2007-01-26  9:25     ` Andrew Morton
2007-01-26  9:37       ` Justin Piszcz
2007-01-26 12:31       ` Justin Piszcz

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