On 08/15/2012 11:06 AM, Martin Wawro wrote: > Hi all, > > We have noticed a strange thing in one of our setups which uses KVM for > virtualization. > The size of the buffer cache turns out to be rather large, here is what > 'top' on the host > has to say about it: > > Mem: 12274084k total, 12202860k used, 71224k free, 2991728k buffers > Swap: 8191992k total, 20232k used, 8171760k free, 44392k cached > > As the host machine itself does not run any data intensive services, we > assume that > this is due to the guest VM which receives/sends about 200 GB of data > per day of which > about 35G have to be stored on disk (disk array connected to the host > and used inside > the guest via virtio). We did not run into problems with this setup, it > basically runs stable > for more than a year now (the buffer size never went past 30% of the > total memory). > However, we are not sure if the huge size of the buffer cache is > something one would > expect here. If this is the case, I would really love to know the reason > behind it and if > it has indeed something to do with KVM/virtio. Any enlightenment here > would make > my day. > > Our setup: > -------------- > > Host: > IBM BladeCenter HS22, 12 GB RAM, Xeon QC CPU > CentOS 5.5 (64-bit) running 2.6.18-194.11.1.el5 > kvm-83-164.el5_5.25 (qemu 0.9.1, modules 2.6.18.194.17.1) > libvirt 0.6.3 > How is you storage set up? Files (which format?) or logical volumes? what's the cache= setting? -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
