* Linux SCSI benchmarking tool??
@ 2003-08-19 4:52 Nayak, Samdeep
2003-08-19 5:03 ` Valdis.Kletnieks
2003-08-19 5:04 ` Nuno Silva
0 siblings, 2 replies; 3+ messages in thread
From: Nayak, Samdeep @ 2003-08-19 4:52 UTC (permalink / raw)
To: linux-kernel
Hi,
I am trying to benchmark a iSCSI driver for performance on a 2.4 kernel. I
have used dd, dt, IOmeter and rawio utilities so far and each seemed to
represent a different picture to me on the same setup (Single target with
few LUNS). (DD showed good performance on an ext2 mounted file system till
I realized that I was writing to the buffer and not writing on the raw
drive). Since I am trying to catch up with the SCSI world, I am just
wondering if any one else has tried any other utilities that would provide
better results or am I doing something wrong here??
-Thanks in advance,
-Regards
Samdeep
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Linux SCSI benchmarking tool??
2003-08-19 4:52 Linux SCSI benchmarking tool?? Nayak, Samdeep
@ 2003-08-19 5:03 ` Valdis.Kletnieks
2003-08-19 5:04 ` Nuno Silva
1 sibling, 0 replies; 3+ messages in thread
From: Valdis.Kletnieks @ 2003-08-19 5:03 UTC (permalink / raw)
To: Nayak, Samdeep; +Cc: linux-kernel
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On Mon, 18 Aug 2003 21:52:54 PDT, "Nayak, Samdeep" <Samdeep_Nayak@adaptec.com> said:
> have used dd, dt, IOmeter and rawio utilities so far and each seemed to
> represent a different picture to me on the same setup (Single target with
> few LUNS). (DD showed good performance on an ext2 mounted file system till
> I realized that I was writing to the buffer and not writing on the raw
> drive). Since I am trying to catch up with the SCSI world, I am just
> wondering if any one else has tried any other utilities that would provide
> better results or am I doing something wrong here??
Those tools report different things because they are measuring different
aspects of the performance. For many system configurations, the fact that 'dd'
is writing on a buffer rather than a drive is actually a *feature*, as you
might care about just how much of a boost the cache is giving you - I don't
care how fast my compile writes to disk, I care how fast the cache and page
subsystems actually present the data to userspace...
"better results" depends on the question - otherwise "42" is as good an answer as
any, for exactly the reasons that Deep Thought gave.... ;)
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Linux SCSI benchmarking tool??
2003-08-19 4:52 Linux SCSI benchmarking tool?? Nayak, Samdeep
2003-08-19 5:03 ` Valdis.Kletnieks
@ 2003-08-19 5:04 ` Nuno Silva
1 sibling, 0 replies; 3+ messages in thread
From: Nuno Silva @ 2003-08-19 5:04 UTC (permalink / raw)
To: Nayak, Samdeep; +Cc: linux-kernel
Hi!
Nayak, Samdeep wrote:
[..snip..]
> I realized that I was writing to the buffer and not writing on the raw
The simple solutions is to boot with 16MB of RAM :)
Just append RAM=16M to linux's command line (in lilo...) and use large
sets of data.
Regards,
Nuno Silva
^ permalink raw reply [flat|nested] 3+ messages in thread
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2003-08-19 4:52 Linux SCSI benchmarking tool?? Nayak, Samdeep
2003-08-19 5:03 ` Valdis.Kletnieks
2003-08-19 5:04 ` Nuno Silva
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