Hi Steve, thanks a lot for your explanation!
Steve Sistare schrieb: > segmap memory consumption is included in the "Page cache" total > of memstat. Good to know! I've just posted a snapshot in my previous mail to Jim. > For UFS on Solaris/SPARC as of as of Solaris 10 3/05, > segmap is no longer used for normal read and write operations. It is > only used in a few oddball places relating to metadata, so you should > be able to reduce it from the default 12% without adverse consequences. That's what I wanted to hear! ;-) > If segmap is too small, and is in high demand from some consumer (the > QFS filesystem as an example), then you will see increased %sys time > and high crosscall counts as shown by the mpstat xcal column - in the > millions of xcal/sec system wide. Thus you can monitor mpstat sys > and xcal before and after reducing segmap_percent to verify there is > little change. Thanks for this hint! I will do this. In fact, a test is already running for some hours. You mention QFS. We only use UFS and PxFS, so I guess we should be ok. Thanks, Nick. _______________________________________________ perf-discuss mailing list perf-discuss@opensolaris.org
