Perc3/Di high load on writing (debian 2.4.20)

Hi,
I experience high load on a PE2650 while writing to disk:

System Setup is:
PE 2650 / 2GB RAM / 2 Xeon 2.4GHz / PERC3/Di with 3x73GB as RAID5
(factory configured)
Kernel is debian 2.4.20-5 / tested this also with 
mem=512M to exclude HIGHIO

Also tested on an older PE2600 2xPIII / 1G RAM / Perc3/Di 3 Disks as RAID5
with Debian kernel 2.4.18

With the command
dd if=/dev/zero of=bigfile bs=1024 count=8000000)
I start writing a big file to disk, and system load starts to increase.
(this has been tested on ext2 and ext3 fs with same result)

Watched the stats via "vmstat 1" shows that I receive about additional 800 irq/s
while this process is running, looking in /proc/interrupts these interrupts 
nearly all belongs to the aacraid.

Another thing is that there are about 8 to 10 noninterruptible sleep
processes.
Since the 2.4.20 has the patch for the irq storm in rx.c (the
time_before problem) there must be another problem with the aacraid driver.

----
vmstat 1 (before this massive write:)

procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy id wa
 0  0   1888 244104 314680 1293220    0    0     0    32  139    87  0 0 100  0
 0  0   1888 244104 314680 1293220    0    0     0     0  168   201  0 0 100  0
 0  0   1888 244104 314680 1293220    0    0     0     0  127    66  0 0 100  0
 0  0   1888 244104 314680 1293220    0    0     0     0  151   152  0 0 100  0
 0  0   1888 243796 314684 1293524    0    0     0   992  647   812  0 0 100  0
 0  0   1888 243792 314688 1293524    0    0     0   192  213   216  0 0 100  0
 0  0   1888 243792 314688 1293524    0    0     0     0  127    52  0 0 100  0
 0  0   1888 243756 314692 1293556    0    0     4   248  392   801  0 0 100  0
 0  0   1888 243724 314692 1293588    0    0     0   464  360   612  0 0 100  0

------
vmstat 1 (while this massive write:)

procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy id wa
 0 12   2572  10904 202788 1690004    0    0     0 27208  963   544  0 12 88  0
 1 11   2700  10964 199104 1695008    0    0     0 25796  959   472  0 12 88  0
 1 12   2956  10160 197152 1700420    0    0     0 27176  963   413  0 12 87  0
 0 12   2956  11144 192820 1703060    0  948     0 28404  962   513  0 11 88  0
 1 10   3084   9844 192372 1705572    0    0     0 26848  947   464  0 15 85  0
 1  7   3084  10496 188124 1711328    0    0    12 27740 1106   660  0 13 86  0
 0  9   3084  12372 182596 1716168    0    0     0 26004  938   489  0 12 87  0

Since this machine is not fully productive until next week, I can test different
kernel/patches and so on if someone has an idee.

Gruss
	Ulli

-- 
\ Ulli Hochholdinger                               E-Mail: [email protected] \
/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ /
\ Sometimes I think the surest sign that intelligent life exists elsewhere \
/ in the universe is that none of it has tried to contact us. (Calvin)     /

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