On Oct 24, 2007, at 14:07, Patrick Sullivan wrote: > I recently posted about a serious performance issue when running a > single thread against my Solaris iSCSI Software Initiator connected > volume. The cause of this performance issue is due to the Nagle > algorithm being used for the network traffic sent to and from the > iSCSI target. Simply disabling the Nagle algorithm solved the > problem. > > Easy enough fix, but it raised a question. If having the Nagle > algorithm enabled could cause this serious a performance > degradation (300k/sec I get with it enabled, 40MB/sec with it > disabled), should it be disabled by default? > > I guess I would be curious as to the reason it is enabled by > default. Does the performance advantage on some targets outweigh > the performance degradation seen when it is enabled for other > targets? 300k/sec is pretty dreadful performance, and for most > applications it could be considered unusable. Granted my testing > was to the raw device, but any application that accesses the raw > device directly is also affected by this (think Solaris Volume > Manager, and I wonder how ZFS would fair, I can test if necessary). > > How would I go about filing a request to change the default to not > use the Nagle algorithm?
File an RFE here: http://www.opensolaris.org/bug/report.jspa pick the latest nevada release --- .je _______________________________________________ storage-discuss mailing list [email protected] http://mail.opensolaris.org/mailman/listinfo/storage-discuss
