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SubjectRE: Kernel performance in reference to 2.4.5pre1
I'll put this on my priority list to look into.  When I get the numbers,
I'll squeak again.


> -----Original Message-----
> From: Andrew Morton []
> Sent: Thursday, October 18, 2001 12:34 PM
> To: DICKENS,CARY (HP-Loveland,ex2)
> Cc: Kernel Mailing List (E-mail); HABBINGA,ERIK (HP-Loveland,ex1)
> Subject: Re: Kernel performance in reference to 2.4.5pre1
> "DICKENS,CARY (HP-Loveland,ex2)" wrote:
> >
> > 2.4.5pre1 is the base for comparison,
> >
> > [ figures showing that more recent kernels suck ]
> >
> SFS is a rather specialised workload, and synchronous NFS exports
> are not a thing which gets a lot of attention. It could be one
> small, hitherto unnoticed change which caused this performance
> regression. And it appears that the change occurred between 2.4.5
> and 2.4.7.
> We don't know whether this slowdown is caused by changes in the VM,
> the filesystem, the block device layer, nfsd or networking.
> For example,
> ksoftirqd was introduced between 2.4.5 and 2.4.7. Could it be that?
> For all these reasons it would be really helpful if you could
> go back and test the 2.4.6-preX and 2.4.7-preX kernels (binary search)
> and tell us if there was a particular release which caused
> this decrease in
> throughput.
> If it can be pinned down to a particular patch then there's a good
> chance that it can be fixed.
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