[Planetlab-users] install gcc and change TCP buffer size

[Neil Spring]

Dhiman,

On Jul 26, 2005, at 10:18 AM, Dhiman Barman wrote:
> Hi,
>    I got two questions:
>
>   * How do I install gcc and vim ?
>    yum -y install {vim,gcc} could not find the packages.

yum install gcc works for me, though compiling on planetlab nodes is  
discouraged.

>   * I want to modify TCP buffer size as follows:
>
>   $ su
>   $ echo 1000000000 > /proc/sys/net/core/wmem_max
>   bash: /proc/sys/net/core/wmem_max: Operation not permitted

Memory is scarce on planetlab; you're not going to get 1GB of memory  
for each of your TCP connections.

Common wisdom is that users who want this style of functionality  
should investigate user-level TCPs to hold the ridiculously-large  
retransmission buffer in swappable memory.

http://lists.planet-lab.org/pipermail/users/2005-April/001270.html

Reconsider your experiment.

-neil