This is why I use Direct-IO to the bare metal block device instead of going through the FS. Rather than discussing the real problem, we're off in the weed talking about whether the tests should be using O_SYNC and whether there is a problem introduced in the latest version of the FS.
FS's and cache are very good at hiding the problems of those things below them and prevent you from exercising the code you're interested in debugging.
Bob Kierski
Senior Storage Performance Engineer
Cray Inc.
380 Jackson Street
Suite 210
St. Paul, MN 55101
Tele: 651-967-9590
Fax: 651-605-9001
Cell: 651-890-7461
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