On Wed, 27 Aug 2008 19:39:05 +0300 Alexander Nezhinsky <nezhinsky@xxxxxxxxx> wrote: > > From 75c9a58fd094360c59b1bcd3e05a429dd8f68f4d Mon Sep 17 00:00:00 2001 > From: Alexander Nezhinsky <nezhinsky@xxxxxxxxx> > Date: Tue, 26 Aug 2008 17:23:37 +0300 > Subject: [PATCH 1/1] null backing store > > Implements a NULL I/O backing store, which shortcuts all scsi commands > and returns a success status without actually performing them. > Useful for performance measurements, by eliminating or significantly > reducing I/O side bottleneck. > > Signed-off-by: Alexander Nezhinsky <nezhinsky@xxxxxxxxx> > --- > usr/Makefile | 2 +- > usr/bs_null.c | 103 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Thanks. But you can do faster. This patch incurs the thread and pipe notification overheads. You don't need bs_thread stuff. See bs_aio.c After that, you can do more faster. You can use sendfile (send data without memory copy) though you need some changes to the core code. -- To unsubscribe from this list: send the line "unsubscribe stgt" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
