Messages in this thread | | | Date | Sat, 12 Dec 1998 15:14:58 -0800 (PST) | From | Al Goldstein n <> | Subject | Re: SMP 2.1.131: SCSI performance extremely poor vs. IDE |
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On Fri, 11 Dec 1998, Mr. James W. Laferriere wrote:
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. > > > > - > > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > > the body of a message to majordomo@vger.rutgers.edu > > Please read the FAQ at http://www.tux.org/lkml/ > > > > , JimL > +-----------------------------------------------------------------------+ > | James W. Laferriere - Network Engineer - babydr@baby-dragons.com | > | System Techniques - 25416 - 22nd S. - Des-Moines, WA 98198 | > | Give me VMS -or- Give me Linux -but- only on AXP | > +-----------------------------------------------------------------------+ > > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.rutgers.edu > Please read the FAQ at http://www.tux.org/lkml/ >
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