Jarod Wilson wrote:
carlopmart wrote:
Sadique Puthen wrote:
carlopmart wrote:
Hi all,
I have an extrange problem on a rhel5.1 xen host. I have 4 xen
guests running: two para-virtualized and two HVM. Memory asignements
are:
xentop - 09:34:05 Xen 3.1.0-53.el5
5 domains: 1 running, 4 blocked, 0 paused, 0 crashed, 0 dying, 0
shutdown
Mem: 3145268k total, 2680980k used, 464288k free CPUs: 2 @ 3213MHz
NAME STATE CPU(sec) CPU(%) MEM(k) MEM(%) MAXMEM(k)
Domain-0 -----r 71 0.0 262192 8.3 no limit
RhelClu01 --b--- 44 0.0 655184 20.8 655360
RhelClu02 --b--- 24 0.0 655224 20.8 655360
RhelFWInt --b--- 45 0.0 532352 16.9 540672
RhelFWPub --b--- 39 0.0 401280 12.8 409600
My xen host has 3GB of RAM. I need to start up a fifth guest with
512M of RAM assigned, but I can't because free memory for guests are
464288. But why??
Doing a simple arithmetic operation:
(262192+655184+655224+532352+401280)-3145268= -639036 free memory,
but xentop says that only 464288kb of RAM are free. Where are
174748kb of RAM that xentop doesn't shows me? Maybe the problem could
be this grub params: kernel /xen.gz-2.6.18-53.el5 dom0_mem=256M
lowmem_emergency_pool=16M [EMAIL PROTECTED]
This reserves 128MB of mem for crash kernel and you would only be able
to see less 128MB from your actual memory on the dom0.
Thanks Sadique. Can I remove crashkernel param and leave
lowmem_emergency_pool without break something???
Removing the crashkernel parameter will disable kdump from being able to
capture a vmcore in the event of a system crash, but yes, you can remove
it without breaking anything else. So that explains where 128M of your
memory went, and I can probably explain the rest: the xen hypervisor
reserves some memory for itself that it doesn't expose even to the dom0
kernel.
Thanks Jarod for your response. But, what are the minimum memory I need to
reserve for crashkernel ??? will be 16 MB ok?? I don't want to disable this if I
need it to debug some crash ...
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--
CL Martinez
carlopmart {at} gmail {d0t} com
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