Discussion of performance issues in NetBSD, especially ways to improve performance

Aleksey Cheusov | 18 Jul 2010 19:37

extreamly slow read/write from/to USB stick on 5.1_RC3

Several day ago I wrote about slow read operation from my USB stick
on 5.1_RC3/amd64

http://mail-index.netbsd.org/port-amd64/2010/07/12/msg001210.html

Today I tried to write to the same USB stick rather big image, about 700
Mb in side and found that write speed is drammatically slower, about
170Kb/s.  Any clue?

Command is: 

dd if=huge_image.img of=/dev/rsd0d

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Best regards, Aleksey Cheusov.

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Erik Fair | 18 Jul 2010 21:27

Re: extreamly slow read/write from/to USB stick on 5.1_RC3

Can you be specific about the devices involved, i.e. the make/model of both the USB Host Controller and the
USB stick? The appropriate lines from the kernel console long (e.g. from dmesg(8)) would be helpful.

	Erik <fair <at> netbsd.org>

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Aleksey Cheusov | 18 Jul 2010 21:54

Re: extreamly slow read/write from/to USB stick on 5.1_RC3

> Can you be specific about the devices involved, i.e. the make/model of
> both the USB Host Controller and the USB stick? The appropriate lines
> from the kernel console long (e.g. from dmesg(8)) would be helpful.

I showed url to my previous email, full dmesg is there.
http://mail-index.netbsd.org/port-amd64/2010/07/12/msg001210.html

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Best regards, Aleksey Cheusov.