Hi Con, Andrea, Jens,
Con and me were testing your, Andrea, lowlatency elevator hack the last days.
It's much impressive that I/O pauses/stopps are almost gone with the hack,
even though the throughput is decreased (22mb/s to 12mb/s for my mashine).
Con did a 3 line change to drivers/block/ll_rw_blk.c and
include/linux/elevator.h and those pauses/stopps are _totally_ gone. Even
throughput increased from 12mb/s, with the lowlat elevator from Andrea, to
14mb/s with that 3 liner. Patch attached + Config option for 2.4.20-rc4.
Exchanging the files mentioned above with the 2.4.18 ones has either no effect
to throughput (22mb/s) and also has no pauses/stopps.
We think the approach with the lowlatency elevator's is fine, but there must
have changed something very seriously in the mentioned files that this occur
with >= 2.4.19.
This is just a "we want to inform you about it" mail :)
Have fun!
ciao, Marc
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This archive was generated by hypermail 2b29 : Sat Nov 30 2002 - 22:00:15 EST