On Mon, 31 Jul 2000, Tigran Aivazian wrote:
[snip]
> I have an old Pentium 120MHz 32M RAM running 2.4.0-test5 and 100Mbit
> ATX-2500 card driven by 8139too driver. Now, when this card is used
> between fast machines (PII/375MHz talking to dual PIII/550MHz) everything
> is fine and I get 7M/second (Mbyte not Mbit!) ftp rates and 9Mbyte/sec
> bonnie over NFS which is close to theoretical limit (I wouldn't expect
> from Linux anything other than being perfect).
[snip]
You should be seeing hot-cache FTPs between those boxes are mote like
12MB/sec then 7MBsec on a crossed-over connection. 7MB is slow.
> But when used on a slow P120MHz I only get 600Kbyte/second ftp transfer
> speeds. Moreover, I noticed that kswapd actually uses some CPU, as much as
> 20-30% thereof! And both the disk and network blinking was in bursts, on
> average resulting in about 600K/seconds.
>
> Then, I accidentally left my finger on a key in a bash session running
> over rlogin to the slow box and, behold, the lights became solid (network
> and hard disk) and the ftp rate jumped up to 1500Kbyte/second. I
> experimented about 5 times on and off to make sure it is not a dream :)
Sounds like some sort of IRQ weirdness. Move the card to another PCI slot
and repeat test.
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This archive was generated by hypermail 2b29 : Mon Jul 31 2000 - 21:00:32 EST