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53 lines
1.3 KiB
Plaintext
53 lines
1.3 KiB
Plaintext
<!doctype linuxdoc system>
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<article>
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<title>RTACCT Utility
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<author>Robert Olsson
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<date>some_negative_number, 20 Dec 2001
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<p>
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Here is some code for monitoring the route cache. For systems handling high
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network load, servers, routers, firewalls etc the route cache and its garbage
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collection is crucial. Linux has a solid implementation.
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<p>
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The kernel patch (not required since linux-2.4.7) adds statistics counters
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from route cache process into
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/proc/net/rt_cache_stat. A companion user mode program presents the statistics
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in a vmstat or iostat manner. The ratio between cache hits and misses gives
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the flow length.
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<p>
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Hopefully it can help understanding performance and DoS and other related
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issues.
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<p> An URL where newer versions of this utility can be (probably) found
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is ftp://robur.slu.se/pub/Linux/net-development/rt_cache_stat/
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<p><bf/Description/
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<p>The format of the command is:
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<tscreen><verb>
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rtstat [ OPTIONS ]
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</verb></tscreen>
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<p> <tt/OPTIONS/ are:
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<itemize>
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<item><tt/-h/, <tt/-help/ - show help page and version of the utility.
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<item><tt/-i INTERVAL/ - interval between snapshots, default value is
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2 seconds.
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<item><tt/-s NUMBER/ - whether to print header line. 0 inhibits header line,
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1 prescribes to print it once and 2 (this is default setting) forces header
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line each 20 lines.
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</itemize>
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</article>
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