Andrew Morton wrote: > A fair bunch of people did a fair bunch of testing of this last year. > Bottom line: RAM-based journals don't speed ext3 up. > The testing was performed with a ramdisk-based journal, > `trd' which is buried in the ext3 CVS server somewhere. I'd > suggest that you have a good play with that before shelling > out, or getting your hopes up. > Please bear in mind that the external journal support is > completely experimental, may change any time, may rot your > socks, etc. > The disappointing performance changes are not really surprising. > A journal write is a single seek. And with most any workload, > there's a complete storm of seeking going on, so the cost of > the journal seek is very low. Was this using full-data journaling? Testing NFS v3 sync clients with large writes? More importantly, what about post-crash recovery, especially with NFS? Just curious. I could see how this stuff isn't very "cool" for Samba and typical services, but for NFS v3 servers using sync writes, I would be shocked if it didn't help at all. Thanx for the info. Any URLs to the archives would be greatly appreciated. -- Bryan -- Bryan J. Smith, Engineer mailto:b.j.smith@ieee.org AbsoluteValue Systems, Inc. http://www.linux-wlan.org SmithConcepts, Inc. http://www.SmithConcepts.com --------------------------------------------------------- 1999 IRS Data: The richer half of all US income earners pay 99% of all US taxes
