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Re: [SSLUG] Report: Results of the Linux uptime survey (fwd)



On Thu, 21 Aug 1997, Jakob Oestergaard wrote:

> > Min erfaring er at 2.0.30 har ret mange problemmer. De ældre kerner har
> > også problemmer, f.eks. så lider førnævnte brandstrup af memory leaks i
> > netkoden. Jeg har snakket med Alan Cox om det, og han ved godt at fejlen
> > er der, men har svært ved at finde den. 
> 
> Hmm. Ret mange ?    Dem vil jeg da gerne hoere om..   Jeg ved at der er et
> memory-leak. Til gengaeld har jeg aldrig lagt maerke til det.  Ostenfeld's
> mail/web server + router koerer 2.0.30, og den er ikke ligefrem plaget af
> enorme hukommelsesforbrug til buffers etc. etc.

Men det gør brandstrup. Sometider for den allokeret op imod 100 MB ram i
net buffers, og det går ret dårligt når maskinen kun har 32 MB ram. Ifølge
Alan Cox er det en fejl som flere andre også har rapporteret. Fælles
trækket er mange netkort, heavy routing og masqurading.

Her er iøvrigt en liste over fejl i netværksdelen alene i 2.0.30:

---------- Forwarded message ----------
Date: Tue, 5 Aug 1997 01:25:31 +0100 (BST)
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Philippe Strauss <philou@lili.urbanet.ch>
Cc: linux-kernel@vger.rutgers.edu, alan@lxorguk.ukuu.org.uk
Subject: Re: Networking shafted [was Re: buffer patch blah blah]

> Hmm. totally shafted? just that?

o       TCP randomly leaks memory in 2.0.30 for no known reason - not
        occuring in 2.0.29
o       /proc/net/* Oops erratically. Trying to pin this down seems
        bh_atomic isnt. Not occuring in 2.0.29
o       TCP can get trapped spamming the network with packets. Not
        occuring in 2.0.29
*       tcpdumping a transparent proxy floods the network with wrong
        packets also in 2.0.2x
o       Appletalk panics with a localtalk device loaded. Also in 2.0.2x
*       Dumping a masquerading ipip tunnel crashes the machine. Also in 
        2.0.2x
o       Bridging leaks memory in 2.0.30 even tho the same code does not in
        2.0.29
o       Random tcp crashes under high connection load irrespective of 
        syn-cookies/rst-cookies - looks like the hash is a problem. Not in
        2.0.29
o       Occasional oopses caused by timer list corruption when handling
        fragmentation bombs. No apparent cause. Doesn't occur in 2.0.29
o       Transparent proxy redirections are broken. Working in 2.0.29
*       PPP memory scribble - Eric has found this one
o       Memory leak with multicasting enabled in 2.0.30 - not in 2.0.29
        but I can't duplicate this one yet.

And a few others. The ones marked "*" are fixed

Mvh. Baldur
References: