Messages in this thread |  | | Date | Mon, 8 Jan 2001 13:30:56 -0800 (PST) | From | Wayne Whitney <> | Subject | Re: Subtle MM bug |
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On Mon, 8 Jan 2001, Rik van Riel wrote:
> How does 2.4 perform when you add an extra GB of swap ?
OK, some more data:
First, I tried booting 2.4.0 with "nosmp" to see if the behavior I observe is SMP related. It isn't, there was no difference under 2.4.0 between 512MB/512MB/1CPU and 512MB/512MB/2CPUs.
Second, I tried going to 2GB of swap with 2.4.0, so 512MB/2GB/2CPUs. Again, there is no difference: as soon as swapping begins with two MAGMA processes, interactivity suffers. I notice that while swapping in this situation, the HD light is blinking only intermittently.
I also tried logging in to a fourth VT during this second test, and it got nowhere. In fact, this stopped the top updates completely and the HD light also stopped. After 30 seconds of nothing (all I could do is switch VT's), I gave up and sent a ^Z to one MAGMA process; this eventually was received, and the system immediately recovered.
Perhaps there is some sort of I/O starvation triggered by two swapping processes?
Again, under 2.2.19pre6, the exact same tests yield hardly any loss of interactivity, I can log in fine (a little slowly) during the top / two MAGMA process test. And once swapping begins, the HD light is continually lit.
Again, I'd be happy to do any additional tests, provide more info about my machine, etc.
Cheers, Wayne
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