On 3/3/2011 12:49 PM, Raphael Hertzog wrote: > That's wrong. The writeback is initiated before the fsync() so the > filesystem can order the write how it wants.
Don't you mean it MAY be initiated if the cache decides there is enough memory pressure? I don't know of any other call besides fsync and friends to force the writeback so before that is called, it could ( and likely is if you have plenty of memory ) still be sitting in the cache and the disk queue idle. > And we use some linux specific ioctl to avoid that fragmentation. Could you be more specific? -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]
