Linux – IP/Process based bandwidth usage stats tool for linux

bandwidthiplinux

I'm looking for a simple tool to report server bandwidth usage based on IP/Process.

The reason for that is one of our servers is "bleeding" bandwidth and there is a need to find out where it's going.

I'm currently using vnstat, but it only reports usage as far as I know.

Best Answer

If you already know WHICH server is "bleeding" bandwidth you might just want to try something as simple as installing your IPTraf package.

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Linux – get swap usage for a process

An interesting question that had me scratching my head for a while.

First, why you have no Swap line: though in theory that was added in kernel 2.6.16, it didn't show up in RHEL until 5.3 or so (kernel 2.6.18-99.el5). Here is the commit (unfortunately not accessible in the RH Bugzilla; if you happen to have an account with appropriate privileges, the Bugzilla id is 443749). http://sophie2.aero.jussieu.fr/distrib/Scientific%20Linux/5x/i386/by-pkgid/351d529f9beeb4e5d936a6d5e3e7813a/files/645

Second, this implies that the top data is unreliable since it is not reading from the smaps (i.e. it is virt - res):

    case P_SWP:
       MKCOL(scale_num(PAGES_TO_KB(p->size - p->resident), w, s));

Third, I regret to say that the kernel is the One True Oracle on how much swap is used, and as far as I can tell the various patches to make the information available in smaps and status are the only way to expose that information. Unfortunately, I see updating your kernel as the only way to get accurate information; either by patching the source yourself (sample patch, no warranty) or updating to kernel 2.6.18-99.el5.

I wish there were an easier answer; blame Linus.

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Linux – get swap usage for a process

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