Re: skb size

Paul D. Farber II (
Wed, 20 May 1998 16:51:13 -0400 (EDT)

Who is this 'consultant'????? I would like him to tour my ISP which uses
LINUX exclusivly cause it DOES work.... Try and do anything critical on
NT and see how long it lasts!

Find a smarter 'consultant'.

Paul D. Farber II
Farber Technology

On Thu, 21 May 1998, Oommen Thomas wrote:

> Hi all,
> We are facing a major throughput problem on our ftp-site under
> slackware linux 2.0.30.
> Testing showed that this may be mainly due to the OS (kernel) limitations.
> UDP services like tftp/rcp as well as SMTP/UUCP give very good throughput,
> though.
> The 'skbuff' settings in 'tcp.c' is said to be hardcoded and fails under
> heavy load. The following line is a typical case in this.
> copy = min(sk->mss - tcp_size, seglen);
> Is there a real problem in the kernel?
> Is this solved in newer versions?
> Is a patch available for the problem?
> The network consultant is even suggesting of replacing the 'free' linux
> with a better & powerful 'real' unix with a 'full' commercial
> implementation of TCP, which will not drop packets on heavy load.
> The advice we received (which we find hard to buy) is that a free OS
> like Linux must not be used for Production servers as the kernel lacks lot
> of TCP functionalities.
> Any hints (to help save linux's as well as our prestige) will be greatly
> appreciated.
> Regards, Imagine Technologies
> Oommen 16,Shaffee Mohammed Road
> Rutland Gate
> eMail: Chennai 600 006
> Voice : 91-44-8211031/733/734/796
> Fax : 91-44-8225341
> -> Pls do not include other recipients of mails when u reply, unless necessary
> -> All FORWARDED mails are send "AS IS" & need not reflect my opinion/ideas
> -> My opinions are not to be attributed as my company's unless stated so
> -----------------------------------------------------------------------------

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to