search for: zfs_getpag

...ge_unlock: page c51b29e0 is not locked Jun 13 19:33:04 mathrock-opensolaris unix: [ID 100000 kern.notice] Jun 13 19:33:04 mathrock-opensolaris genunix: [ID 353471 kern.notice] d1fafb54 unix:page_unlock+160 (c51b29e0) Jun 13 19:33:04 mathrock-opensolaris genunix: [ID 353471 kern.notice] d1fafbb0 zfs:zfs_getpage+27a (d1e897c0, 3 000, 0, ) Jun 13 19:33:04 mathrock-opensolaris genunix: [ID 353471 kern.notice] d1fafc0c genunix:fop_getpage+36 (d1e897c0 , 8000, 0, ) Jun 13 19:33:04 mathrock-opensolaris genunix: [ID 353471 kern.notice] d1fafca0 genunix:segmap_fault+202 (ce043f 58, fec23310,) Jun 13 19:33:04 mat...

...in aggregate, the segmap cache gets 100% hits for 1-3 attempts *every 10 seconds*--while all other samples are zero% for zero attempts. I don''t know the kernel I/O path as well as I''d like, but I tried to see requests for ZFS to grab a file/offset block from disk by DTracing fbt::zfs_getpage (assuming it was the ZFS equivalent of ufs_getpage) and got no hits as well. In other words, it''s as if ZFS isn''t using the segmap cache. Secondly, DTrace scripts show the IOzone application is reading 8KB blocks, but by the time the physical I/O happens it''s balloo...

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