[Lustre-discuss] Performance drop (1.6.5 vs 1.6.4.3, OFED 1.2)?

[Johann Lombardi]

On Wed, Jul 16, 2008 at 03:41:17PM +0200, Andrei Maslennikov wrote:
>  Client   : Intel  X5450 at 3.00GHz 2xQuad core, 16GB RAM,
>               Infiniband, RHEL4 x86_64
>  Servers: Official 1.6.4.1
>  Single stream writing: (lmdd of=/lustre/tstfileXX bs=1M time=200 fsync=1)

Does it mean that you run 1.6.4.1 on the OSSs even when testing 1.6.5.1?
Because 1.6.5.1 clients cannot use adler32 checksums if the OSSs don't support
it and thus fall back to crc32. In 1.6.4.x, checksumming was disabled by default
because crc32 was the only supported checksum type and it hurt performance (see
bug 13805).

Johann