SACK

i am using linux kernel 2.4.20-8
By default, SACK is enabled

but i want to disable it
i use
echo 0 > /proc/sys/net/ipv4/tcp_sack

after then, i run my program for about 4 minutes
the compute hangs
My program can run with enabled tcp_sack

so i want to know how should i disable SACK ?

thanks a lot!

On 2004-09-02, johnny lau <(E-Mail Removed)> wrote:
> i am using linux kernel 2.4.20-8
>
but from what distro? There is no kernel '2.4.20-8' per say. Are there any
'custom' patches you have?

> By default, SACK is enabled
>
> but i want to disable it
> i use
> echo 0 > /proc/sys/net/ipv4/tcp_sack
>
> after then, i run my program for about 4 minutes
> the compute hangs
> My program can run with enabled tcp_sack
>
no description of what your program does I notice or details about the
'hang'. When you say 'hang' does it mean the program stalls sending data or
is it because your actual computer locks up? Is it the whole computer or
just network activity?

> so i want to know how should i disable SACK ?
>
SACK is very useful and should not be disabled

Cheers

Alex

"johnny lau" <(E-Mail Removed)> wrote in message news:<1093546473.901968@eng-ser4>...
> i am using linux kernel 2.4.20-8
> By default, SACK is enabled
>
> but i want to disable it
> i use
> echo 0 > /proc/sys/net/ipv4/tcp_sack

Why do you want to disable it? I've never encountered _any_ problems
with it.

> after then, i run my program for about 4 minutes
> the compute hangs

Sounds like it's trying to tell you to leave it enabled.

> My program can run with enabled tcp_sack
> so i want to know how should i disable SACK ?

Given your experience, why on earth do you want to do this -- makes no
sense at all.

> thanks a lot!

Look here then get back with an explanation of why you want to do
this.
http://ipsysctl-tutorial.frozentux.n...al.html#AEN463

Your technique for turning it off is correct -- though it won't
survive a re-boot ;-)

regards,
prg
email above disabled