-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
100 2393 88.8 14381 80.5 4067 42.5 2657 91.4 13936 59.9 493.9 13.7
How does this stack up? is it a SMP only thing?
*--* Mail: email@example.com
*--* Voice: 425.739.4247
*--* Fax: 425.827.9577
- - - - - - O t a k i n c . - - - - -
On 10 Dec 1998, Ben Gertzfield wrote:
> >>>>> "Stephen" == Stephen C Tweedie <firstname.lastname@example.org> 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 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" <email@example.com>
> Subject: AW: SMP 2.1.131: SCSI performance extremely poor vs. IDE
> To: "Ben Gertzfield" <firstname.lastname@example.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
> 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. :)
> 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 email@example.com
> Please read the FAQ at http://www.tux.org/lkml/
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to firstname.lastname@example.org
Please read the FAQ at http://www.tux.org/lkml/