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I just had a quick play with gzip compression on a filesystem and the result was the machine grinding to a halt while copying some large (.wav) files to it from another filesystem in the same pool. The system became very unresponsive, taking several seconds to echo keystrokes. The box is a maxed out AMD QuadFX, so it should have plenty of grunt for this. Comments? Ian

...2 0 38 7 0 0 19 124 30 3889 15 962 51948 230 44 0 62 0 38 We ran lockstat to see what was causing the high SMTX and found this: root at dcivolume01:~# lockstat -D 10 sleep 2 Adaptive mutex spin: 706601 events in 2.060 seconds (342956 events/sec) Count indv cuml rcnt nsec Lock Caller ------------------------------------------------------------------------ ------- 402581 57% 57% 0.00 13105 0xffffff0d492ad678 kidmap_cache_lookup_uidbys id+0x51 265969 38% 95% 0.00 10882 0xffffff0d492ad678...