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Diffstat (limited to 'Documentation/networking/Configurable')
-rw-r--r-- | Documentation/networking/Configurable | 34 |
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1 | |||
2 | There are a few network parameters that can be tuned to better match | ||
3 | the kernel to your system hardware and intended usage. The defaults | ||
4 | are usually a good choice for 99% of the people 99% of the time, but | ||
5 | you should be aware they do exist and can be changed. | ||
6 | |||
7 | The current list of parameters can be found in the files: | ||
8 | |||
9 | linux/net/TUNABLE | ||
10 | Documentation/networking/ip-sysctl.txt | ||
11 | |||
12 | Some of these are accessible via the sysctl interface, and many more are | ||
13 | scheduled to be added in this way. For example, some parameters related | ||
14 | to Address Resolution Protocol (ARP) are very easily viewed and altered. | ||
15 | |||
16 | # cat /proc/sys/net/ipv4/arp_timeout | ||
17 | 6000 | ||
18 | # echo 7000 > /proc/sys/net/ipv4/arp_timeout | ||
19 | # cat /proc/sys/net/ipv4/arp_timeout | ||
20 | 7000 | ||
21 | |||
22 | Others are already accessible via the related user space programs. | ||
23 | For example, MAX_WINDOW has a default of 32 k which is a good choice for | ||
24 | modern hardware, but if you have a slow (8 bit) Ethernet card and/or a slow | ||
25 | machine, then this will be far too big for the card to keep up with fast | ||
26 | machines transmitting on the same net, resulting in overruns and receive errors. | ||
27 | A value of about 4 k would be more appropriate, which can be set via: | ||
28 | |||
29 | # route add -net 192.168.3.0 window 4096 | ||
30 | |||
31 | The remainder of these can only be presently changed by altering a #define | ||
32 | in the related header file. This means an edit and recompile cycle. | ||
33 | |||
34 | Paul Gortmaker 06/96 | ||