Are these speeds normal for a 33mhz machine?

Are these speeds normal for a 33mhz machine?

Post by levin magrude » Fri, 18 Jun 1999 04:00:00



I'm trying to figure out if there's anything to troubleshoot with what
seems to be slowness, or if the performance I'm getting is normal for
an older machine.  I have a 33mhz 486, I'm running debian 2, linux
2.0.36.  An example of what seems slow: using "select" menu choice in
dselect takes 180 seconds to show the menu.  Some timings of simpler
things are below.

I've read about processor cache causing problems; my boottime setup
interface says External Cache is "present" and Internal Cache is
enabled.  At boot time, I get a message right after the self-test:
"64K Cache," I don't know what cache that's referring to.

So: 1. are the times below out of line for an older machine like
mine, and 2. if so, are there troubleshooting FAQs beyond the
material in  FAQ "The system slows to a crawl when I add memory."
(which I can pursue if I can find my MB manual, sigh).


% free
             total       used       free     shared    buffers     cached
Mem:         18080      15948       2132       7420       1124       8920
-/+ buffers/cache:       5904      12176
Swap:        37916       4932      32984

% time man bash >/dev/null

real    0m10.850s
user    0m9.540s
sys     0m0.580s

% time lynx -dump http://localhost > /dev/null
#using the comes-with-apache page here
real    0m4.219s
user    0m3.230s
sys     0m0.110s

% time perl -e 'use CGI;'

real    0m5.148s
user    0m4.910s
sys     0m0.170s

% time perl -e ';'

real    0m0.321s
user    0m0.260s
sys     0m0.060s

 
 
 

Are these speeds normal for a 33mhz machine?

Post by Terry Fielde » Fri, 18 Jun 1999 04:00:00


Have you tried using "top" to examine what process are eating up cpu
slices...  This is where I would look next.

64k sound like to much for 486 cpu internal cache.  It sucks for external
(motherboard) cache, but many machines had that around the 33MHz era.  It
could also be a reported cache size from a hard drive, and/or scsi
controller...

Terry Fielder


>I'm trying to figure out if there's anything to troubleshoot with what
>seems to be slowness, or if the performance I'm getting is normal for
>an older machine.  I have a 33mhz 486, I'm running debian 2, linux
>2.0.36.  An example of what seems slow: using "select" menu choice in
>dselect takes 180 seconds to show the menu.  Some timings of simpler
>things are below.

>I've read about processor cache causing problems; my boottime setup
>interface says External Cache is "present" and Internal Cache is
>enabled.  At boot time, I get a message right after the self-test:
>"64K Cache," I don't know what cache that's referring to.

>So: 1. are the times below out of line for an older machine like
>mine, and 2. if so, are there troubleshooting FAQs beyond the
>material in  FAQ "The system slows to a crawl when I add memory."
>(which I can pursue if I can find my MB manual, sigh).


>% free
>             total       used       free     shared    buffers     cached
>Mem:         18080      15948       2132       7420       1124       8920
>-/+ buffers/cache:       5904      12176
>Swap:        37916       4932      32984

>% time man bash >/dev/null

>real 0m10.850s
>user 0m9.540s
>sys 0m0.580s

>% time lynx -dump http://localhost > /dev/null
>#using the comes-with-apache page here
>real 0m4.219s
>user 0m3.230s
>sys 0m0.110s

>% time perl -e 'use CGI;'

>real 0m5.148s
>user 0m4.910s
>sys 0m0.170s

>% time perl -e ';'

>real 0m0.321s
>user 0m0.260s
>sys 0m0.060s


 
 
 

Are these speeds normal for a 33mhz machine?

Post by David Graha » Fri, 18 Jun 1999 04:00:00


In this case, the 64k is the Level 2 (external) cache.  Usual--generous,
even--for a 486/33.

The timings don't sound out of line for a 486/33 with 18MB (?) RAM.

Check the BIOS.  You may need to "enable" the external cache as well.
Also, whenever you find the MB manual :) see what it says about maximum
cacheable memory and stuff like that.  How much RAM can be cached
depends on the amount of cache RAM installed/enabled.  If only 16 MB can
be cached by 64k, for instance, then the extra 2 MB of uncached RAM will
have the effect of slowing down your system instead of speeding it up.

Good luck,
David Graham
--  

Quote:> > ...  I have a 33mhz 486, I'm running debian 2, linux
> >2.0.36.  An example of what seems slow: using "select" menu choice in
> >dselect takes 180 seconds to show the menu.  Some timings of simpler
> >things are below.

> >I've read about processor cache causing problems; my boottime setup
> >interface says External Cache is "present" and Internal Cache is
> >enabled.  At boot time, I get a message right after the self-test:
> >"64K Cache," I don't know what cache that's referring to.

> >So: 1. are the times below out of line for an older machine like
> >mine, and 2. if so, are there troubleshooting FAQs beyond the
> >material in  FAQ "The system slows to a crawl when I add memory."

 
 
 

1. assuming 33mhz bus speed

Hi; I have a PIII450/AsusP6SBA/700+mb/RH7.2, dmesg says;
ide: Assuming 33MHz PCI bus speed for PIO modes; override with idebus=xx
Motherboard instructions say we support up to 100mhz with a PIII450.
When I add idebu=100 to lilo.conf I get a complaint. Will this make a
difference in application speed? My apps (file browsing, internet,
etc) are dragging like crazy. Memory problem?
--

Bill Jehle
http://billjehle.com

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