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. -- Jarod Wilson [EMAIL PROTECTED]
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