Very slow file copy?

DDNI · 16 March 2009, 17:14

Hi,

I am in the process of backing up my real Amiga HDD to a USB HDD through WinUAE (latest version).

The Amiga HDD is using uaehf.device the USB is made present using the "ADD PC HDD on Startup" check.

Copying files from the Amiga HDD to the USB HDD is excrutiatingly slow.
Will adding buffers to the AmigaHDD speed things up?

thomas · 16 March 2009, 20:08

Quote:

Will adding buffers to the AmigaHDD speed things up?

Yes. If it's FastFileSystem, use 1000 or more buffers.

But in my experience you get much more improvement if you play with WinUAE's priority settings and the CPU idle slider. Experiment with priorities above or below normal (yes, sometimes below is better than above) and make sure that WinUAE does not stop when it looses focus.

For the CPU idle slider I get best results if it is moved to somewhere in the middle. Both far left and far right slow down emulation.

Also make sure that the Amiga system you use has a graphics card and Picasso96 installed. And disable filters and sound. Heavy emulation of the native custom chips slows down disk access, too.

And of course make sure that JIT is enabled with highest possible buffer. This should be self-evident.

Toni Wilen · 16 March 2009, 20:14

Writes aren't cached by WinUAE (reads have very simple cache) or Windows. Windows cache is in filesystem driver which is of course bypassed.

DDNI · 16 March 2009, 21:03

The Amiga HDD has SFS in its RDB. However I am booting into a standard WB3.1 environment to do the copying.

I will try adding buffers, what do you recommend?

thomas · 16 March 2009, 22:16

I am not sure, but I think I read somewhere that SFS has an upper limit from which on more buffers won't help more. Something like 800 or so.

Perhaps you can try ClassicWB_P96. It's probably the quickest way to get away from the native chipset, if you don't want to install P96 yourself.

16 March 2009, 17:14	#1
DDNI Targ Explorer Join Date: Mar 2006 Location: Northern Ireland Posts: 5,433	Very slow file copy? Hi, I am in the process of backing up my real Amiga HDD to a USB HDD through WinUAE (latest version). The Amiga HDD is using uaehf.device the USB is made present using the "ADD PC HDD on Startup" check. Copying files from the Amiga HDD to the USB HDD is excrutiatingly slow. Will adding buffers to the AmigaHDD speed things up?

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16 March 2009, 20:14	#3
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,553	Writes aren't cached by WinUAE (reads have very simple cache) or Windows. Windows cache is in filesystem driver which is of course bypassed.

16 March 2009, 21:03	#4
DDNI Targ Explorer Join Date: Mar 2006 Location: Northern Ireland Posts: 5,433	The Amiga HDD has SFS in its RDB. However I am booting into a standard WB3.1 environment to do the copying. I will try adding buffers, what do you recommend?

16 March 2009, 22:16	#5
thomas Registered User Join Date: Jan 2002 Location: Germany Posts: 7,024	I am not sure, but I think I read somewhere that SFS has an upper limit from which on more buffers won't help more. Something like 800 or so. Perhaps you can try ClassicWB_P96. It's probably the quickest way to get away from the native chipset, if you don't want to install P96 yourself.

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