Memory Performance Issue with Fedora Core 2 Kernels
James Foris
james.foris at med.ge.com
Tue Jul 27 13:53:18 UTC 2004
Dave Mitchell wrote:
> Do you still get the slowdown if you mmap /dev/zero rather than your
> driver?
>
Forwarding the responce:
Transfers from /dev/zero -> /dev/shm are unreasonably high (e.g. 128.000 MB
in 0.000028 sec), which suggests that there isn't really any I/O going on
here.
Transfers from /dev/zero to disk are approximately 2x faster, but still
slow. Instead of around 20MB/s it looks like around 40 MB/s.
John
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