My typical use of a computer is writing code, compilation and
test/debugging.
A small test performed with the Asus P5QL SE mainboard:
1) Start "make clean && make" in a terminal (uses >30 minutes, which is slooow
compared to other older computers)
2) Run "top" in another terminal
Output from "top":
-------- 8< --------
top - 09:16:34 up 14 min, 3 users, load average: 4.10, 3.40, 1.81
Tasks: 155 total, 2 running, 153 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.3%us, 0.2%sy, 0.0%ni, 0.0%id, 99.5%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 2072260k total, 1245388k used, 826872k free, 25856k buffers
Swap: 0k total, 0k used, 0k free, 637636k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
5496 root 20 0 418m 46m 11m R 1 2.3 0:34.00 Xorg
6100 petter 20 0 21216 3104 1780 S 1 0.1 0:00.52 gnome-screensav
8956 petter 20 0 2416 1172 876 R 1 0.1 0:00.44 top
1 root 20 0 2120 1076 640 S 0 0.1 0:01.18 init
-------- 8< --------
"us" was typically <10% and rarely ~30% for a long time (a lot of >90%wa
as above) periodically during the half hour or so. When the >90%wa
occurs (which can be frequently), far more than a minute (!) can be used
on a tiny cpp-file. To my knowledge no other HDD-time-consuming
processes are running. Periodically the system seems to be OK, with
typically ~50% of the time in "us" and ~50% in "id" (due to usage of
only one CPU in the dual core?).
IMHO: a lot of time is spent waiting for I/O to complete. More CPU time
should be spent on compiling the code (User CPU time). The Asus P5QL SE
mainboard (and a lot of other mainboards?) is not compatible with the
current Ubuntu 8.10 (kernel 2.6.27-11).
The trick from the GuiGuy did not work for me. The only units connected
to SATA during this test was the HDD (WDC WD2500KS-00MJB0). No IDE
devices.
I hope this is relevant for the slow SATA bug. Let me know if I can
perform other tests to help solve this issue.
--
Slow SATA performance
https://bugs.launchpad.net/bugs/119730
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