On 1/13/06, Helmut Toplitzer <[EMAIL PROTECTED]> wrote: > > Hi!
Hi, > I've got a question about a small experiment I made: > I tried to find out the transfer-rate of my hd by useing > hdparm -t /dev/hda > and got changing transferrates starting from > > 37MB/s with CPU not utilized > 55MB/s with CPU 100% utilized I can't reproduce this locally, please send me your kernel config. Although I have Intel chipset it is still worth a try if it is generic kernel bug. I don't remember seeing anything like that on my old VIA system which also had VT8235 southbridge - if somebody has similar machine to Helmut's please try to reproduce this behavior (thanks!). > 22MB/s with ehci-hcd loaded and a device already initilized > 55MB/s with ehci-hcd loaded and CPU 100% utilized > (see log1/log2) As discussed in this thread: http://marc.theaimsgroup.com/?l=linux-kernel&m=111765523627674&w=2 It seems that the problem is caused by flakey USB chipset thus IDE folks cannot do much about it, sorry. David, can we get this issue documented somewhere? > So is this supposed normal operation? Or is there > something wrong with it? > Even tried useing the lirc_dev and lirc_i2c kernel-modules > from the lirc project (Infrared remote over usb) and got > only 12MB/s on hda until using CPU with 100%. also seems like USB caused problem > So it looks like CPU/USB/IDE is in some interaction. Any > ideas what to do against this. My current kernel is > 2.6.15 Bartlomiej ------------------------------------------------------- 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&kid3432&bid#0486&dat1642 _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
