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Date:      Tue, 20 Aug 2002 12:17:29 +0200 (CEST)
From:      Tomas Pluskal <plusik@pohoda.cz>
To:        freebsd-hardware@freebsd.org, <freebsd-stable@freebsd.org>
Subject:   slow ATAPI ZIP and USB camera
Message-ID:  <20020522134805.X565-200000@s096-n062.tele2.cz>

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Hello,

I am using FreeBSD 4.6 RELEASE, and my ATAPI ZIP drive and USB camera are
very slow. I have done a simple measuring with FreeBSD and Windows 98
(these are not exact benchmarks, but the difference is so big that it
doesn't matter).

on FreeBSD:

Copying from ZIP drive to HDD: about 100 KB/s
Copying from USB camera to HDD: about 50 KB/s
Copying from HDD to HDD (big file): about 10 MB/s
Copying from CDROM to HDD: about 3 MB/s

on Windows 98:

Copying from ZIP drive to HDD: about 680 KB/s !!
Copying from USB camera to HDD: about 460 KB/s !!
Copying from HDD to HDD (big file): about 10 MB/s
Copying from CDROM to HDD: about 4 MB/s

I have 2 IDE controllers in my computer, DMA is active on both HDD, the
CDROMs and ZIP use PIO mode. USB camera is using the umass driver.

My "sysctl hw | grep ata" output:

hw.ata.ata_dma: 1
hw.ata.wc: 1
hw.ata.tags: 0
hw.ata.atapi_dma: 0
hw.atamodes: dma,---,pio,pio,pio,---,dma,---,

Full dmesg is attached.
Any idea why this is so slow ?

Thanks

Tomas Pluskal
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