Comments on: Linux Tuning The VM (memory) Subsystem

By: Alex

Alex — Fri, 23 Apr 2010 16:18:57 +0000

Some of these changes made some absolutely remarkable improvements in performance on a few heavily-loaded mail servers and large berkeley db’s storing bayes data. Well worth experimenting. I lowered cache pressure to 40 and set fs.aio-max-nr = 1048576.

By: Sheldon

Sheldon — Sun, 18 Oct 2009 22:44:57 +0000

You need to be careful with increasing these values. You may flush less frequently, but when you do you’ll have more data to write to disk and it will take longer, which could impact system latency and interactivity. Also, if your system crashes and you have more in RAM that is not flushed to disk you risk losing that data.

By: Philippe Petrinko

Philippe Petrinko — Fri, 16 Oct 2009 11:54:16 +0000

Fine. But then concerning your “cd” and then “ls”,
I am afraid I disagree. It’s a better way to keep it short and simple.
This said “ls -al /proc/sys/vm” is better than “cd” and then “ls”
as far as none of your commands need to be run later in this directory.
[Your site is read by many, so please see my concern as an expression of my admiration for your work Teach them the KISS principle ;-) ]

By: Vivek Gite

Vivek Gite — Fri, 16 Oct 2009 11:43:10 +0000

Thanks for the heads up!

By: Philippe Petrinko

Philippe Petrinko — Fri, 16 Oct 2009 11:03:25 +0000

In “Say Hello” chapter: Typo: may be: “ls -al /proc/sys/vm” instead of just: “ls -l” ?