Messages in this thread | | | From | John Helms <> | Date | Fri, 15 Mar 2002 20:32:46 GMT | Subject | Re: bug (trouble?) report on high mem support |
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Alan,
Ok, how do I go about determining that? The machine I have is a brand-spankin' new IBM x-series 350 with 4 900MHz Xeon processors. The system bios can recognize all of the 16320MB of memory at startup. If those patches work, it will save our butts as we have a major conversion project that hinges on this.
Thanks, jwh
>>>>>>>>>>>>>>>>>> Original Message <<<<<<<<<<<<<<<<<<
On 3/15/02, 2:30:22 PM, Alan Cox <alan@lxorguk.ukuu.org.uk> wrote regarding Re: bug (trouble?) report on high mem support:
> > Here is a top output. We have 16Gb of ram. > > I have also tried a 2.4.9-31 enterprise=20 > > kernel rpm from RedHat with the same=20 > > results.
> Ok that would make sense. Next question is do you have an I/O controller > that can use all the 64bit address space on the PCI bus ?
> What is happening is that you are using a lot of CPU copying buffers down > into lower memory to transfer to/from disk - as well probably as that > causing a lot of competition for low memory. If your I/O controller can hit > the full 64bit space there are some rather nice test patches that should > completely obliterate the problem.
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