P166/ SCO 5/ AHA-2940UW/ abysmal disk performance...

P166/ SCO 5/ AHA-2940UW/ abysmal disk performance...

Post by Donald Mac Phee » Sat, 07 Dec 1996 04:00:00



Ugh.

   I currently have a Pentium 166 with 32MB of EDO RAM, 256K Cache;
an Adaptec 2940UW controller, and a Conner 2Gig Wide(+ Fast?) drive.
We run quite a bit of disk intensive work and the performance
bottleneck seems to be the Harddrive.

Example: (from sar)

%busy   avque   r+w/s   blks/s  avwait  avserv
76.67   17.01   19.23   102.29  638.45  39.88

(40ms service time?!?!?)
This was at a point I was fairly thrashing the disk. The system also
reports at that time the CPU was 50% idle, and I'm lightly swapping.

NBUF = 8192
NHBUF = 8192
BDFLUSHR = 15
nhinode = 1024
noautoup = 30
nstream = 1024
NSTREVENT = 2048
numsp = 256
htcacheENTS = 1500
HTHASHQS = 1019
HTOFBIAS = 8

HELP! (I'm also using the adaptec driver that came with 5.0)

--
Don Mac Phee    | The universe is not only stranger than we imagine;
Systems Manager | it's stranger than we *CAN* imagine.
Crown Optical   |                             And we make their glasses...
Greenville, RI  | If you want my employer's opinion, ask him.

 
 
 

1. problem with the Adaptec AHA-2940UW ProproProblem with the Adaptec AHA-2940UW Pro

Hi!

Mandrake 6 - Venus Installation ...

My system is PII 400, 256 RAM, 7.6 GB UDMA33 HDD (hda1 = 5.8GB /, hda2 =

1 GB /home, hda3 = 126MB Swap), Plextor 32X CDROM, Plextor 12X/4X CD-R,
Adaptec AHA-2940UW Pro SCSI Controller, 3C905 10/100TX Netcard, Creative

PCI 64 Soundcard, Asuscom ISDN-Card ...

I'm having a slight problem with the Adaptec AHA-2940UW Pro host
adapter.
The boot disk (from Mandrake 6) detects the adapter and then the two
drives no problem and installs everything just fine ...

when the system reboots and probes for SCSI adapters, it tries to load
the aic7xxx module with the following result:

Loading aic7xxx module
scsi : 0 hosts
/lib/aic7xxx.o: init_module: Device or resource busy

I've tried both the module and kernel with aic7xxx with the same
effect....
I have read SCSI-Howto and SCSI Programming HOWTO wich could not solve
my problem ...

Is there some commands I have to pass to the kernel on boot like that
linear setting it offers in installation (which I didn't set)? This is
the first
Linux installation on an SCSI system I'm making so I'm somewhat in the
dark.

Markusi!

Mandrake 6 - Venus Installation ...

My system is PII 400, 256 RAM, 7.6 GB UDMA33 HDD (hda1 = 5.8GB /, hda2 =

1 GB /home, hda3 = 126MB Swap), Plextor 32X CDROM, Plextor 12X/4X CD-R,
Adaptec AHA-2940UW Pro SCSI Controller, 3C905 10/100TX Netcard, Creative

PCI 64 Soundcard, Asuscom ISDN-Card ...

I'm having a slight problem with the Adaptec AHA-2940UW Pro host
adapter.
The boot disk (from Mandrake 6) detects the adapter and then the two
drives no problem and installs everything just fine ...

when the system reboots and probes for SCSI adapters, it tries to load
the aic7xxx module with the following result:

Loading aic7xxx module
scsi : 0 hosts
/lib/aic7xxx.o: init_module: Device or resource busy

I've tried both the module and kernel with aic7xxx with the same
effect....
I have read SCSI-Howto and SCSI Programming HOWTO wich could not solve
my problem ...

Is there some commands I have to pass to the kernel on boot like that
linear setting it offers in installation (which I didn't set)? This is
the first
Linux installation on an SCSI system I'm making so I'm somewhat in the
dark.

Markus

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