Messages in this thread |  | | Date | Fri, 14 Jun 1996 13:25:21 -0400 | From | hab <> | Subject | SCSI vs IDE swapping |
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Alan Cox wrote: > > > the afformentioned kernels, a cycle/IO hungry process can really impact > > system performance. I was quite horrified comparing my Sparc clone > > (SunOS 403) which had 8MB (12ms SCSI2 in SCSI1 mode HD) versus a 8MB > > 486/33 (10ms ISA IDE HD) ... Granted the 486 would be slower, but the > > Your IDE disk drive is the big problem, it needs a lot of CPU supervision so > swapping gets very very CPU intensive instead of being just a queueing > operation with the card doing the smarts. 2.0.0 should be about as good as > we can get on IDE (its a lot better all around for swapping than 1.2 as it > uses very good algorithms now). > > Alan
Alan Could you go a little deeper into this. On my desktop I have both IDE and SCSI. My scsi drive is an old 28 millisec off a 2842a controller but I've been using as the swap device for years(originally on a 1540a) I've been tempted to replace it with a Fast Scsi II device but when I compare the transfer speeds to the IDE why bother. 10 vs 14 meg. On the other hand My laptop with ide only seems totally consumed with swapping. Due to the difference in memory sizes DT=16M LT=8M i assumed memory or cache was the problem DT=DX2-66 vs LT=DX4-100 since the laptop had the processor speed advantage. I also have a 1522 compatible pcmcia card on the laptop for CD and scanner purposes so I could add an external SCSI device. The laptop IDE is a 1.2Gig Toshiba I don't know the specs. What are some of the pro's and cons. Is the advantage SCSI controllers in general or are their classes of them that make a difference cpu processing demands.
Hubert
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