> > Did disabling ACPI change something? > No, it didn't
> > When CPU is idle HLT instruction is used by default (for power saving). > Probably chipset detects when CPU is entering low power mode and > also enters low power mode. Switching between low and normal power > modes is slow and results in degraded performance. > > The question is whether/how we can program chipset to not enter > low power mode. > Ok. Was just a bit digging through the sourcecode. Found a function called disable_hlt. Some further digging. Found in drivers/block/floppy.c a usage of disable_hlt. It's called (if I haven't missunderstood something) whenever a DMA transfer is setup. enable_hlt is called when a transfer stops/is cancled etc... Does such thing makes sense for IDE DMA-transfers too? (Maybe I've missed something) Cheers Helmut -- My GNUpg fingerprint http://www.gnupg.org 4563 F4FB 0B7E 8698 53CD 00E9 E319 35BD 6A91 1656 ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=103432&bid=230486&dat=121642 _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
