Re: Readahead value 128K? (was Re: Drastic Slowdown of 'fseek()' Calls From 2.4 to 2.6 -- VMM Change?)

[Mark Lord <lkml@rtr.ca>]

Marr wrote:
> Anyway, not that it really matters, but I re-did the testing with '-a0' and it 
> didn't help one iota. The 2.6.13 kernel on ReiserFS (without using 
> 'nolargeio=1' as a mount option) still takes about 4m35s to fseek 200,000 
> times on that 4MB file, even with 'hdparm -a0 /dev/hda' in effect.
Does it make a difference when done on the filesystem *partition*
rather than the base drive?  At one time, this mattered, and it may
still work that way today.

Eg.  hdparm -a0 /dev/hda3   rather than   hdparm -a0 /dev/hda

??
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/