open that file with O_DIRECT flag or u can use sg_dd to read u usb device like /sdX directly with o_direct=1. man sg_dd for information. search sg3_utils via google to get this. ming On Tue, 2006-04-04 at 16:13 +0100, Bahadir Balban wrote: > Hi, > > I am trying to measure usb transfer throughput by timing file read > operations from a usb flashdisk into main memory. The results seems to > be imprecise and I suspect this is due to filesystem caching. How > could I prohibit filesystem caching in the kernel? > > Do you know of any GPL'ed usb benchmarks? Maybe I should measure this > in the kernel rather then application space? > > Thanks, > Bahadir > > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
