Using async brought the performance of random access 8KB reads up 26% to about 4.3 MB/sec. Still a long way off the Windows speed.
-fred > Frederick Shotton wrote: > > In conducting tests on a 4GB USB 200x memory stick, I find that using Linux > > 2.6.17 reading 8KB blocks I get 12MB/sec for sequential access and 3MB/sec > > for random access. The interesting thing is that under Windows with the same > > memory stick I get 10MB/sec for both sequential and random access. My goal > > is to get the fastest random access speed under Linux. > > > > I have delved into the internals of the usbstorage driver and tried various > > settings such as the GO_SLOW flag, but none of them help. I have also tried > > bypassing the usbstorage driver using libusb and got the same performance > > numbers. > > > > Any ideas? > > > How do you mount it? you probably have the sync flag.. if you use > async it will be much faster. > > mount -o async /dev/usbstick /mnt/point > > -- > > -- > Karl Hiramoto http://karl.hiramoto.org/ > > -- > Are there those in the land of the brave > Who can tell me how I should behave > When I am disgraced > Because I erased > A file I intended to save? > ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
