Hard disk bottle neck.
wojtek at wojtek.tensor.gdynia.pl
Sun Sep 28 15:00:05 UTC 2008
> the following code:
> patch /usr/src/sys/sys/param.h
> #ifndef DFLTPHYS
> #define DFLTPHYS (1024 * 1024) /* default max raw I/O transfer size
> #ifndef MAXPHYS
> #define MAXPHYS (1024 * 1024) /* max raw I/O transfer size */
> #ifndef MAXDUMPPGS
> I'll update the result. I'll tell you how I go. Maybe sometimes in the next
> Thanks everyone, thanks Wojciech Puchar,
after you recompile the kernel with that patch, check your disk
performance in some directory consisting of many large files
for x in *;do (cat $x >/dev/null &);done
while running systat,:vmstat on another console
i've just did this on one of my systems, with ONE 500GB SATA drive and
with geli encryption.
got 48MB/s and about 50% CPU load with core2 duo.
More information about the freebsd-questions