Curtis Faith wrote: > > This is the trickle syncer. It prevents bursts of disk activity every > > 30 seconds. It is for non-fsync writes, of course, and I assume if the > > kernel buffers get low, it starts to flush faster. > > AFAICT, the syncer only speeds up when virtual memory paging fills the > buffers past > a threshold and even in that event it only speeds it up by a factor of two. > > I can't find any provision for speeding up flushing of the dirty buffers > when they fill for normal file system writes, so I don't think that > happens.
So you think if I try to write a 1 gig file, it will write enough to fill up the buffers, then wait while the sync'er writes out a few blocks every second, free up some buffers, then write some more? Take a look at vfs_bio::getnewbuf() on *BSD and you will see that when it can't get a buffer, it will async write a dirty buffer to disk. As far as this AIO conversation is concerned, I want to see someone come up with some performance improvement that we can only do with AIO. Unless I see it, I am not interested in pursuing this thread. -- Bruce Momjian | http://candle.pha.pa.us [EMAIL PROTECTED] | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073 ---------------------------(end of broadcast)--------------------------- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]
