Hello Alec,
Thanks for the reply...nope Iam not running any RAID, but I always thought
that the i386 code on say a P3 is slower ??? I am sure Intel said something
like that, or was is between 32 bit and 16 bit stuff...
Thanks,
Pieter
-----Original Message-----
From: Alec Smith <snip>
Sent: 08 April 2001 12:42
To: <snip>
Subject: Re: Have I slowed down my server ???
First, the easy part.... You'll see those messages about promiscuous from
tcpdump, ntop, and several other programs if you run them.
Second, i686 is used to indicate any CPU from the Pentium Pro through (I
believe) the P4. This also includes the current AMD Athlon-based designs.
The P4 should in theory be an i786-type CPU, however the kernel gods had a
reason for sticking with i686 -- I've forgotten what Alan Cox's explanation
was offhand.
Finally, most code is compiled for i386 since there often isn't much to be
gained speed-wise when using i586, i686, etc optimizations. Its easier to
compile the few things where it can make a difference than compiling a
whole distribution for each CPU type. Also, code compiled for i386 will in
theory run on anything i3860->up whereas you can't run anything compiled
for i586 on anything but i585 and i686, or i686-compiled code on anything
but i686. Basically, you can go forwards but not backwards.
Are you using RAID on your system? (You'd know if you were since its not an
automatically configured item -- far from it) If not, then the messages you
list are relating to portions of the kernel which have no effect on your
system. I suspect the p5_MMX referrs simply to a processor with MMX
(Pentium MMX/i385 being the first).... Though I'm no kernel hacker and
can't be sure.
At 11:37 AM 4/8/2001 +0200, you wrote:
>Hello Guys and Gals,
>
>I was reading in a book about the diff. installation packs. For example you
>get
>
>bla.vers.i386.rpm
>bla.vers.i586.rpm
>bla.vers.i686.rpm
>
>Now, when I look at my system's startup message I found the following...
>
>raid5: measuring checksumming speed
>raid5: MMX detected, trying high-speed MMX checksum routines
>pII_mmx: 1779.651 MB/sec
>p5_mmx: 1869.186 MB/sec
>8regs: 1373.886 MB/sec
>32regs: 770.001 MB/sec
>using fastest function: p5_mmx (1869.186 MB/sec)
>
>Now I see that this has raid5 in front of it...but yet it picks the p5 (or
>i586 as I can guess) code. All my rpm's I have installed are .i386. When I
>run uname -m it reports a i686, although these machines are p3...
>
>Will up2date "upgrade" to the right processor ? Did I in fact slow do my
>server by installing 386 code ?
>
>Another thing that I noted is this message...
>
>device eth0 entered promiscuous mode
><snip>
>device eth0 left promiscuous mode
>
>Does this mean a hacker has been around, or is it simply me running the
>tcpdump command ?
>
>theww, what a mouth full :)
>
>Thanks,
>
>Pieter
>
>
>
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