sluggish disk performance.

[Chris Knipe]

Hi,

    2 users    Load  0.06  0.12  0.11                  Aug 21 17:48

Mem:KB    REAL            VIRTUAL                     VN PAGER  SWAP PAGER
        Tot   Share      Tot    Share    Free         in  out     in  out
Act  122748   10896   524836    30684   14216 count
All  247916   13364  3418388    40552         pages
                                                                 Interrupts
Proc:r  p  d  s  w    Csw  Trp  Sys  Int  Sof  Flt        cow     373 total
          18100       689   12  369  484   15       81872 wire    100 0: clk
                                                   124232 act      41 4: 
sis0
 3.7%Sys   0.3%Intr  0.2%User  1.2%Nice 94.6%Idl    29988 inact   128 8: rtc
|    |    |    |    |    |    |    |    |    |      13564 cache       10: 
rl0
==-                                                   652 free        13: 
npx
                                                          daefr   104 14: 
ata
Namei         Name-cache    Dir-cache                     prcfr
    Calls     hits    %     hits    %                     react
      357      357  100                                   pdwake
                                          zfod        340 pdpgs
Disks   ad0                               ofod            intrn
KB/t  16.83                               %slo-z    35456 buf
tps     103                             4 tfree       414 dirtybuf
MB/s   1.70                                         20988 desiredvnodes
% busy   98                                          5247 numvnodes
                                                     4223 freevnodes


Got 1 ATA100 Seagate 120GB disk in there at the moment.... 1.7MB/s at 98% 
busy?  Surely, that figure is WAY low???  I'd expect atleast about 10MB/s on 
ATA100.

dmsg detects everything right obviously,
atapci0: <SiS 630S UDMA100 controller> port 
0xd800-0xd80f,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 at device 0.1 on pci0
ata0: channel #0 on atapci0
ata1: channel #1 on atapci0
...
ad0: 114473MB <ST3120026A/8.01> [232581/16/63] at ata0-master UDMA100


Anything I can look at to speed this up?  It's not the most powerfull system 
ever, P3 850 with 1GB Ram... But I *definately* expect allot more than 2MB/s 
for 100% load...

Thanks,



Regards,
Chris.