Ahmed, >> On 25 Apr 2003 17:38:43, Ahmed A <ahmedcali@yahoo.com> said: > How can I turn off all sorts of caching, so all reads/writes are > directly to the device. Can I pass certain options to open, or > change kernel to disable cache. The O_DIRECT flag to open(2) will disable caching, where available. (I'd be interested to hear from someone regarding *how* available it is; the last I heard it was in x86-64, and not in arch/i386 because it would break binary compatibility -- but then there was a more recent thread on linux-kernel that seemed to offer a patch to add it to i386.) hdparm(1) is commonly used for disk timing: `hdparm -t [device]`. Hope this helps, - Chris. -- $a="printf.net"; Chris Ball | chris@void.$a | www.$a | finger: chris@$a -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
