I'm honestly not trying to be a smart-ass by posting this since I haven't played with these *a single bit* - however, this was what I found:
<berlin>/sys % find . | grep ahead ./block/hdf/queue/read_ahead_kb ./block/hdg/queue/read_ahead_kb ./block/hdc/queue/read_ahead_kb ./block/hda/queue/read_ahead_kb
Maybe those are the appropriate knobs to twiddle? If so, it appears they've gone per-device, and they've moved to sysfs...
Thanks! Maybe that's why I couldn't find it. I was looking through sysctl settings, which only run through /proc (I guess). I keep forgetting /sys exists now.
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