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

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

??
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