https://bugzilla.novell.com/show_bug.cgi?id=371575 Summary: 100% "wait" CPU usage in read/write from Hard Drive with AHCI Intel P965 chipset Product: openSUSE 10.3 Version: Final Platform: x86-64 OS/Version: Other Status: NEW Severity: Normal Priority: P5 - None Component: Kernel AssignedTo: kernel-maintainers@forge.provo.novell.com ReportedBy: cmorve69@yahoo.es QAContact: qa@suse.de Found By: --- When reading or writing from my ST3320620AS SATA hard drive top shows ~50%wa CPU usage (dual core CPU). When copying big files between hard drives this is noted in system responsiviness, and when trying to burn DVDs from files stored in this hard drive the DVD buffer and write speed shows a lot of variance (they don't fail only because of BURN-Proof). Trying to burn a DVD from the same files stored in a Maxtor 6Y120L0 PATA hard drive, connected to a pata_jmicron motherboard controller CPU usage is normal. I think the problem wasn't shown with openSUSE 10.2, but I can't be sure. In openSUSE 10.2 NCQ wasn't supported, but disabling NCQ in 10.3 ("echo 1 > /sys/block/sda/device/queue_depth") doesn't helps. kernel-default-2.6.22.17-0.1 Motherboard is an ASUS P5B ( http://www.asus.com/products.aspx?l1=3&l2=11&l3=307&l4=0&model=1178&modelmenu=1 ) In the BIOS both disk controllers are configured like AHCI. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.