I recently complained of a constipated scsi on kernel 2.0.36. on redhat5.0
J Menion suggested editing nisswitch.conf removing nis references. I did
that just leaving dns. Voila. A redhat bug? On kernel 2.1.31 there was
no constipation however even without editing nis out.
>
> Hello Ben,
>
> On 10 Dec 1998, Ben Gertzfield wrote:
> > >>>>> "Stephen" == Stephen C Tweedie <sct@redhat.com> writes:
> >
> > Stephen> This "benchmark" is so full of variables that it is
> > Stephen> utterly meaningless on its own. You are running on two
> > Stephen> different systems. Is performance repeatable or not?
> > Stephen> How much memory is in each system? How fragmented are
> > Stephen> the existing disks? How much of the data is in the
> > Stephen> buffer cache when you do the rm?
> >
> > I agree that it's utterly meaningless on its own, but one of the
> > complaints I receive most often about Linux is that deleting large
> > files/large directories takes a *long* time on many systems, which
> > suggests that there is a small problem hidden somewhere.
> >
> > If there is a better benchmark that I can test with, please let me
> > know what it is, so that I can get more meaningful statistics.
> I don't about a benchmark for file removal, Although I'd
> try something like 5 plain text of some differant sizes
> (IE: 1mb, 10mb, 50mb, 100mb, 1gb), Then 5 compressed of simular
> sizes . Then run the removes like thus :
>
> time rm 'file1mb'
> ...
> Hth
>
> > I received several responses to my report in private mail (I wish
> > they'd Cc:ed linux-kernel) -- they confirmed what I'd noticed, that
> > SCSI behavior in Linux lately has gotten slower and slower.
> >
> > From: "Daniel Roesen" <droesen@gmx.net>
> > Subject: AW: SMP 2.1.131: SCSI performance extremely poor vs. IDE
> > To: "Ben Gertzfield" <che@debian.org>
> > Date: 09 Dec 1998 08:58:33 -0800
> >
> > I noticed this with an ICP Vortex RAID Controller (100GB Stripeset) attached
> > to a 4xXeon SMP, too. 5MB/sec with large blocks with bonnie. Not quite
> > impressive...
> >
> > *snip*
> >
> > Ben> This is, frankly, terrible. Since when is IDE three times
> > Ben> faster than ultra-wide SCSI?
> >
> > Stephen> IDE command setup latency is a _lot_ lower than SCSI's,
> > Stephen> especially with UDMA. If all you are measuring is random
> > Stephen> read seek rates, then yes, IDE can quite easily be faster
> > Stephen> than SCSI.
> >
> > But three times faster? Something's not quite right there. :)
> >
> > Ben
> >
> > --
> > Brought to you by the letters Q and S and the number 9.
> > "Mmm.. slanty.." -- Homer Simpson
> > Debian GNU/Linux -- where do you want to go tomorrow? http://www.debian.org/
> > I'm on FurryMUCK as Che, and EFNet and YiffNet IRC as Che_Fox.
> >
> > -
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> >
>
> , JimL
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