Re: 2.6.0 NFS-server low to 0 performance

[Guennadi Liakhovetski]

On 7 Jan 2004, bill davidsen wrote:

> I'm sure you checked this, but does mii-tool show that you have
> negotiated the proper connection to the hub or switch? I found that my
> 3cXXX and eepro100 cards were negotiating half duplex with the switches
> and cable modems, causing the throughput to go forth and conjugate the
> verb "to suck" until I fixed it.

Actually, I didn't. Just tried - mii-tool says
SIOCGMIIPHY on 'eth0' failed: Operation not supported
no MII interfaces found
And if you look in the tulip driver you'll see the same - ADMtek Comet
doesn't have the HAS_MII flag set:-( Is it really that bad? It was a cheap
(damn it, when will I learn not to buy cheap stuff, even if it says
"Linux supported"...) card, no technical documentation, none on
www.sitecom.com either. I've sent them a service-request though. Also
funny, on their site they say, it's a realtek 8139 chip... I would even
less hope that the other 3c59x card, which can only do half-duplex (I
think) 10mbps, has mii... But - the light on the hub and on the card say
it's 100mbps full-duplex. Actually, if something was wrong with network
settings - ftp wouldn't work reliable either, right? Well, maybe it
affects UDP only somehow. Well, yes - with TCP it seems to work. Only now
I have another problem with my PC2 with 2.6 (Pentium 133MHz, 24M). It
swaps like a mad already under very mild load... Have to narrow it down
though... So, 4M file I was able to copy without problem to tmpfs, 120M to
the disk lasts already many minutes (~30) with hard swapping. Problem is I
can't use terminals in such situation - they become nearly irresponsive.
So, only sysrq's work... Hm, just looked at the backtrace of the cp
process - it looks completely sick.
__wake_up_common
preempt_schedule
__wake_up
wakeup_kswapd
__alloc_pages
read_swap_cache_async
read_swap_cache_async
swapin_readahead
do_swap_page
handle_mm_fault
do_page_fault
do_page_fault
do_DC390_Interrupt
handle_IRQ_event
end_8259A_irq
do_IRQ
error_code

So, since TCP works - shall we consider the case closed, or shall UDP also
be fixed? Ok, presumably, Linux-Linux can always use TCP, what about other
UNIXes? Can they also do mount -otcp?

...and what is this:
RPC request reserved 0 but used 116

Thanks
Guennadi
---
Guennadi Liakhovetski


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