Re: [linux-audio-dev] disk latency under 2.4.19 ll+preempt
On 19 Nov 2002 15:29:19 -0500 jfm3 [EMAIL PROTECTED] wrote: I'm running the low latency and preemption kernel patches on 2.4.19. I'm getting disk copy latency of around 10ms. Since I'm a real time person (according to M. Goggins) who doesn't use the hd in real time, I can live with this, but it bugs me. I've tried ext2 and ext3, no difference. Any other tips? Do you have support for your chipset unabled under IDE, ATA and ATAPI Block devices in your kernel configuration, and Use PCI DMA by default when available? I believe this is rather important. Maarten
Re: [linux-audio-dev] disk latency under 2.4.19 ll+preempt
From: Maarten de Boer [EMAIL PROTECTED] Date: Wed, 20 Nov 2002 08:29:31 +0100 On 19 Nov 2002 15:29:19 -0500 jfm3 [EMAIL PROTECTED] wrote: I'm running the low latency and preemption kernel patches on 2.4.19. I'm getting disk copy latency of around 10ms. Since I'm a real time person (according to M. Goggins) who doesn't use the hd in real time, I can live with this, but it bugs me. I've tried ext2 and ext3, no difference. Any other tips? Do you have support for your chipset unabled under IDE, ATA and ATAPI Block devices in your kernel configuration, and Use PCI DMA by default when available? I believe this is rather important. On my asus A7V266-E board i had to set down dma mode from DMA100 to DMA33 get LL working fine. (3ms) - Stefan _ STOP MORE SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail
Re: [linux-audio-dev] disk latency under 2.4.19 ll+preempt
On my asus A7V266-E board i had to set down dma mode from DMA100 to DMA33 get LL working fine. (3ms) That is very interesting information (I have the same board). Did you discover this by trial and error? Maarten
Re: [linux-audio-dev] disk latency under 2.4.19 ll+preempt
I have Use PCI DMA by default when available set to Y already. In terms of the DMA mode, are you talking about a BIOS setting or something I can do with the right software to manipulate the drivers? Right now I run: /sbin/hdparm -m 8 -d 1 -u 1 -c 1 /dev/hda Thanks for the help! Do you have support for your chipset unabled under IDE, ATA and ATAPI Block devices in your kernel configuration, and Use PCI DMA by default when available? I believe this is rather important. On my asus A7V266-E board i had to set down dma mode from DMA100 to DMA33 get LL working fine. (3ms) -- (jfm3 2838 BCBA 93BA 3058 ED95 A42C 37DB 66D1 B43C 9FD0)
Re: [linux-audio-dev] disk latency under 2.4.19 ll+preempt
On my asus A7V266-E board i had to set down dma mode from DMA100 to DMA33 get LL working fine. (3ms) That is very interesting information (I have the same board). Did you discover this by trial and error? Yes and No ;) i had one old cable to disk2 and when i tried the latency test on the 2nd drive (DMA33) all worked fine. I have the latest BIOS installed. - Stefan _ Add photos to your e-mail with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail
