On Tue, Oct 09 2007 at 16:56 +0200, Andi Kleen <[EMAIL PROTECTED]> wrote: > Michael Stiller <[EMAIL PROTECTED]> writes: >> The write(2) performance is not good enough, the writer threads take to >> much time, and i ask you for ideas, howto to boost the write >> performance. > > You could use an O_DIRECT write if the data is suitably aligned > and your IO sizes are big enough (O_DIRECT is usually a loss > on small IOs). It will also be synchronous, but if you do it > from a separate thread anyways that should be fine. > > -Andi
If your target is a SCSI target you can gain up to 15% by using sg. Search on the net for the "sg utils" package. The source code of sg_dd and others are a grate example of how to do it. Other wise O_DIRECT is your friend. Also look for asynchronous I/O so you have a few pending IO buffers to keep the pipes full. Boaz - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
