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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [edk2] The size of memory is wrong inside of virtual machine(VM) when using OVMF
On 06/07/15 14:29, Wei Liu wrote: > On Mon, Jun 01, 2015 at 09:13:08AM +0000, Maoming wrote: >> Hi all: >> I encountered a troublesome problem about OVMF. >> I used OVMF.fd as a BIOS of virtual machine(VM). >> >> 1ãmy environment: >> xen_version : 4.6-unstable >> I git clone xen from git://xenbits.xen.org/xen.git. configure it and >> parameters as below: >> ./configure --prefix=/usr/ --libdir=/usr/lib/ --enable-ovmf then >> make && make install, after that I reboot my host OS(suse11sp3). >> >> There is a same problem in KVM too. >> >> 2ãproblem: >> I started a VM whose memory is 64G in the host. >> The size of memory inside of the VM is wrong while it is OK when I >> check it in the host using "xl list". >> But, when I changed the memory to 63G,it was both OK. >> (1)64G memory >> inside of VM using "free" to check: >> total used free shared buffers >> cached >> Mem: 3715640 495916 3219724 0 22060 >> 175136 >> -/+ buffers/cache: 298720 3416920 >> Swap: 4046840 0 4046840 >> It is only 3.5G. >> >> in the host using "xl list" to check: >> Name ID Mem VCPUs State >> Time(s) >> Domain-0 0 3055 16 r----- >> 861.2 >> redhat 4 65536 2 r----- >> 5.9 >> >> (2)63G memory >> inside of VM using "free" to check: >> total used free shared buffers >> cached >> Mem: 64918224 1083912 63834312 0 22188 >> 175344 >> -/+ buffers/cache: 886380 64031844 >> Swap: 4046840 0 4046840 >> It is OK. >> >> in the host using "xl list" to check: >> Name ID Mem VCPUs State >> Time(s) >> Domain-0 0 3055 16 r----- >> 821.2 >> redhat 3 64512 2 -b---- >> 48.5 >> >> 3ãmy cfg file: >> builder = "hvm" >> name = "redhat" >> memory = 65536 >> maxmem = 65536 >> vcpus = 2 >> bios = "ovmf" >> boot = "dc" >> sdl=0 >> disk = [ 'file:/test/image/redhat6_3.img,xvda,w' ] >> vnc = 1 >> vnclisten = '9.61.1.31' >> vncdisplay = 0 >> >> Any thought on this? >> Any help will be appreciated. >> If you need some other information, please let me know. :) >> > > It looks like there is some kind of truncation inside OVMF. But I don't > have a test box that has so much memory so I cannot try it myself. The issue is real. I've been working on some patches today for this. I'll soon send an RFC series. It's actually easy to *test* this scenario: just create a 128GB or so file, with "fallocate", on a sufficiently big filesystem. Then format it with mkswap and add it with swapon. I have strict memory overcommit settings on my laptop (/proc/sys/vm/overcommit_memory = 2), but with such a swap file, a >= 64GB guest can easily be started. (I used my old spindle disk for the swap file. Since the guest is doing practically nothing, it doesn't cause the disk to thrash.) Thanks Laszlo > Since it manifests on both Xen and KVM I don't really have an idea about > what's going on. > > The only thing I can say is that the tested OVMF tree for Xen is > > http://xenbits.xen.org/gitweb/?p=osstest/ovmf.git;a=summary > xen-tested-master > > The one in xen.git is updated periodically. Make sure you use our > latest tested branch so you can get fixes from upstream. > > Wei. > >> Thanks! >> -mao > >> _______________________________________________ >> Xen-devel mailing list >> Xen-devel@xxxxxxxxxxxxx >> http://lists.xen.org/xen-devel > > > ------------------------------------------------------------------------------ > _______________________________________________ > edk2-devel mailing list > edk2-devel@xxxxxxxxxxxxxxxxxxxxx > https://lists.sourceforge.net/lists/listinfo/edk2-devel > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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