Slow speed Direct HD access

23 December 2002, 05:49

I asked about this in a different forum and never got an answer. :-/

Anyway, I was wondering if there is something in my system doing this or if it is just WinUAE that is the problem. I have my "old" Amiga's HD connected and working as a direct accessed HD in WinUAE (RDB prepped and all). Only problem is it is really slow. I get about 1 MB/s write speeds and 3 MB/s read speeds (and this is if I tell Windows to enable the Write Cache on the drive!). This drive I have measured 12 MB/s read and 10 MB/s writes, sustained, on both my old real Amiga (now dead) and on this PC before I reformatted it back to Amiga RDB prepped (I had it as a FAT32 drive for a while).

Do I need to do something to get this to go faster? Is this a bug in 0.8.22r3? I'm getting ready to install r4, so I don't know yet if this will fix my issue or not (no mention of it in the notes on winuae.net).

Any ideas? :-)

23 December 2002, 05:56

OK, just tried r4, and no change. Any ideas anyone?

Toni Wilen · 23 December 2002, 08:55

Ok, I thought it was my old test hard drive that was slow

I think WinUAE needs cache that merges multiple small reads to single big read (because Windows does not use any software disk caches when directly accessing harddisk blocks)

Toni Wilen · 27 December 2002, 14:21

Dan, contact me privately.

23 December 2002, 05:49	#1
Dan Andrea Posts: n/a	Slow speed Direct HD access I asked about this in a different forum and never got an answer. :-/ Anyway, I was wondering if there is something in my system doing this or if it is just WinUAE that is the problem. I have my "old" Amiga's HD connected and working as a direct accessed HD in WinUAE (RDB prepped and all). Only problem is it is really slow. I get about 1 MB/s write speeds and 3 MB/s read speeds (and this is if I tell Windows to enable the Write Cache on the drive!). This drive I have measured 12 MB/s read and 10 MB/s writes, sustained, on both my old real Amiga (now dead) and on this PC before I reformatted it back to Amiga RDB prepped (I had it as a FAT32 drive for a while). Do I need to do something to get this to go faster? Is this a bug in 0.8.22r3? I'm getting ready to install r4, so I don't know yet if this will fix my issue or not (no mention of it in the notes on winuae.net). Any ideas? :-)

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23 December 2002, 05:56	#2
Dan Andrea Posts: n/a	OK, just tried r4, and no change. Any ideas anyone?

23 December 2002, 08:55	#3
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,505	Ok, I thought it was my old test hard drive that was slow I think WinUAE needs cache that merges multiple small reads to single big read (because Windows does not use any software disk caches when directly accessing harddisk blocks)

27 December 2002, 14:21	#4
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,505	Dan, contact me privately.

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