> * Marc-Christian Petersen (m.c.p@wolk-project.de) [20021124
> 15:23]:
> Marc, Andrea,
>> I think Andrea and me have something in our kernels that may
>> cause it. For me I don't know what that can be. I even have no
>> idea what it can be :(
> The culprit turned out to be an inherited CONFIG_NFS_DIRECTIO
> setting. Having the client kernel (2.4.20rc2aa1) this option
> turned off, performance is stable 4 MB/sec (server hasn't
> changed). This is almost twice as good as with 2.4.19-rmap14b.
Huh? Sounds like something is seriously screwed up in your kernel
build then. CONFIG_NFS_DIRECTIO should should result in 2 things only:
- direct.c gets compiled.
- the 'direct_IO' address space operation gets defined, so that the
VFS knows what to do with files that get opened with the O_DIRECT
flag.
None of the ordinary NFS read and write code paths should be affected
by the above.
Cheers,
Trond
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