Re: Direct io on block device has performance regression on 2.6.x kernel

From: Andrew Vasquez
Date: Wed Mar 09 2005 - 23:37:01 EST

On Wed, 09 Mar 2005, Chen, Kenneth W wrote:

> Andrew Morton wrote Wednesday, March 09, 2005 6:26 PM
> > What does "1/3 of the total benchmark performance regression" mean? One
> > third of 0.1% isn't very impressive. You haven't told us anything at all
> > about the magnitude of this regression.
> 2.6.9 kernel is 6% slower compare to distributor's 2.4 kernel (RHEL3). Roughly
> 2% came from storage driver (I'm not allowed to say anything beyond that, there
> is a fix though).

Ok now, that statement piqued my interest -- since looking through a
previous email it seems you are using the qla2xxx driver. Care to

Andrew Vasquez
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