On AIX I think you can define the maximum size for the cache e.g. 20%/80%... I read something on RedHat vm fine tuning about a parameter is pagetabledir or something...but I think this is no longer available in 2.6 kernels I guess the only recourse is to add memory, which could easily rack up several hundred thousand moolahs...
On Dec 15, 2007 10:20 PM, Orlando Andico <[EMAIL PROTECTED]> wrote: > Unfortunately this is not something we can do very much about. > > I run into this problem ALL THE TIME, and we don't have any decent > solution. There are 2 issues here: the read cache, and the write > cache. > > You can "get rid" of the write cache by using the mount option -o sync > but that will result in eye-popping performance reductions. I tried > that, wasn't worth the performance hit. > > There's really not much way of "tuning" the Linux buffer cache > behavior. That's why the big DB vendors etc. use raw filesystem, to > get around the O/S caching mechanisms and gain more control. > > I've even seen this behavior (overly greedy buffer cache starves > applications of RAM) even on AIX. But then I don't know enough about > AIX to know if it can be worked around on that platform. > > Another thing you can try is run with no swap... > > > -- --- Kelsey Hartigan Go Registered Linux user #5998
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