Date: Wed, 22 Mar 1995 12:18:24 -0800 (PST) From: John-Mark Gurney <gurney_j@efn.org> To: Poul-Henning Kamp <phk@ref.tfs.com> Cc: hackers@FreeBSD.org, faq@FreeBSD.org Subject: Re: Why IDE is bad Message-ID: <Pine.SUN.3.91.950322121300.14941C@haus.efn.org> In-Reply-To: <199503220841.AAA04565@ref.tfs.com>
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On Wed, 22 Mar 1995, Poul-Henning Kamp wrote:
> I just made a simple test, this shows why IDE is inferior to SCSI for
> FreeBSD:
here is my test of IDE using an EIDE disk on a VL/EIDE controler with
dual channel... and using the patches submitted a while ago to use 32-bit
data transfer of the vl/eide card...
> 540868608 bytes transferred in 240 secs (2253619 bytes/sec)
>
> Here is what "systat" tells me:
> 2.0%Sys 82.0%Intr 0.5%User 0.0%Nice 15.6%Idle
> | | | | | | | | | |
> =+++++++++++++++++++++++++++++++++++++++++
ok... mine was using a Conner CFA-850a (if I remeber right) only
540868608 bytes transferred in 336 secs (1609728 bytes/sec)
but on a 486/33DX running at 40... I never passed 14% on system... I
don't have intr as I only am using 2.0... and I might add this was under
a multiuser system... and the adverage was about 5% sys... it was
generating about 3000 inters a second and near then end jumped up to 4000...
>
> Quantum Empire 2100 SCSI-II disk on VL-buslogic controller:
> -------------------------------------------------------------
> dd if=/dev/rsd0d of=/dev/null bs=64k count=8253
> 8253+0 records in
> 8253+0 records out
> 540868608 bytes transferred in 110 secs (4916987 bytes/sec)
>
> Here is what "systat" tells me:
> 5.6%Sys 20.6%Intr 0.2%User 0.0%Nice 73.6%Idle
> | | | | | | | | | |
> ===++++++++++
>
> CONCLUSION:
> -----------
> The SCSI-controller transfers twice as much data in the same time, and
> uses only 25% of the CPU resources the IDE-controller needs.
was the IDE isa? or using the same footing as the vl/bus SCSI? not to
flame or anything...
John-Mark Gurney
gurney_j@efn.org -or-
gurney_j@4j.lane.edu -or-
Fido: John-Mark Gurney @ 1:152/56.2
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