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Amiga computer related discussion => Amiga Software Issues and Discussion => Topic started by: derringer3 on July 16, 2007, 07:13:08 PM

Title: Avarage cpu load on OS3.9
Post by: derringer3 on July 16, 2007, 07:13:08 PM

I recently installed a new scsi drive to my system. Everybody says that with scsi and 10 000 rpm drives read/write faster than 10Mbyte/sec and no cpu load. My problem is that when  after my system booted up, dopus (ver 4.17 pre20) shows a 17-33% cpu load for my 68040@33MHz. (Changing every sec between these numbers) When i copy something to one of my scsi partition to an other scsi partition, cpu load go up about 97%!!!. I knew that scsi had a dma! And only in sysspeed the result of drive test shows an avarage 9 Mbyte/sec transfer. Under dopus this is about 2.4-2.6 MByte/sec.
So this is OS3.9 performance or some util eat my cpu's time?

Title: Re: Avarage cpu load on OS3.9
Post by: Matt_H on July 16, 2007, 07:18:56 PM

I don't think the DOpus CPU meter is terribly accurate. Mine idles between 40% and 60%, while Scout reports a mere 10%.

Title: Re: Avarage cpu load on OS3.9
Post by: derringer3 on July 16, 2007, 08:10:03 PM

I tried idle (68k version of course), its seems to be correct, only the same problem when copying files between scsi partitions. Not 97%, but it shows 67%. Anyway it gives mostly 0% when i do nothing.

Title: Re: Avarage cpu load on OS3.9
Post by: Boot_WB on July 16, 2007, 08:14:55 PM

What scsi device are you using? Some scsi cards are DMA, whilst others are not.

Also, what are the mask settings of your partitions?

Title: Re: Avarage cpu load on OS3.9
Post by: derringer3 on July 16, 2007, 09:27:35 PM

I'm using bppc's scsi, so it has dma. Hmmm mask: 0x7ffffffe

Title: Re: Avarage cpu load on OS3.9
Post by: Boot_WB on July 16, 2007, 09:45:10 PM

Check out patrick's post (post #7) in this thread (http://www.amiga.org/forums/showthread.php?t=23415) for a good benchmarking of different mask settings.

Title: Re: Avarage cpu load on OS3.9
Post by: CLS2086 on July 16, 2007, 09:49:57 PM

Ok, but which FS ? and cache ?

Title: Re: Avarage cpu load on OS3.9
Post by: derringer3 on July 17, 2007, 12:20:58 AM

I'm useing SFS.
I'm set the mask and maxtransfer to the values which patrik recommended.But no changeing in transfer rates.