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Re: dd backup unbelievably slow on SATA laptop

On 1/4/07, Kevin Kempter <kevin kevinkempterllc com> wrote:
Hi List;

I have FC5 on an IBM Thinkpad Z60m with 2G of RAM and a 100G SATA HD.  I also
have a removeable CD/DVD drive and I can insert a HD adapter into
the "ultrabay" which adds a second HD attached to the main bus (as the CD/DVD
would be).

I inserted the second 100G ATA HD into the ultrabay and booted into single
user mode. The second HD shows up as /dev/hdc my main HD shows up
as /dev/sda.  (Note if I boot with hdc=noprobe into single user mode then the
system is not aware of the root user)

I run this:
dd if=/dev/sda of=/dev/hdc bs=64K &

Note: I've tried the same with bs=128K, bs=1M, bs=256K and with no bs tag at
all with the same results

Then I check the progress from time to time with this:
kill -USR1 $pid

I find that my avg speed in 1.7m/sec which leads to a full backup time of
around 16-17 hours.

Before the deal with M$ I used to run SuSE 10 and was able to do a dd on the
same laptop inside of 4 hours.

It sounds like DMA is disabled.

L. Friedman                                    netllama gmail com
LlamaLand                       http://netllama.linux-sxs.org

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