On May 9, 2010, at 6:30 AM, Roy Sigurd Karlsbakk wrote: > ----- "Bob Friesenhahn" <bfrie...@simple.dallas.tx.us> skrev: > >> On Sat, 8 May 2010, Edward Ned Harvey wrote: >>> >>> A vast majority of the time, the opposite is true. Most of the >> time, having >>> swap available increases performance. Because the kernel is able to >> choose: >>> "Should I swap out this idle process, or should I dump files out of >> cache?" >>> With swap enabled, the kernel is given another degree of freedom, to >> choose >>> which is colder: idle process memory, or cold cached files. >> >> Are you sure about this? It is always good to be sure ... > > This is the case with most OSes now. Swap out stuff early, perhaps keep it in > RAM and swap at the same time, and the kernel can choose what to do later. In > Linux you can set it in /proc/sys/vm/swappiness. > > Anyone that knows how this is tuned in osol, btw?
This is a better question for perf-discuss. For a storage server, swap is not needed. If you notice swap being used then your storage server is undersized. -- richard -- ZFS storage and performance consulting at http://www.RichardElling.com _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
