* Richard W.M. Jones <[EMAIL PROTECTED]> [2007-09-28 11:20]: > beth kon wrote: > >Richard W.M. Jones wrote: > > > >>My results are a bit inconclusive. I have a machine here which > >>supposedly supports NUMA (2 socket, 2 core AMD with hypertransport and > >>two separate banks of RAM). > >> > >>BIOS is _not_ configured to interleave memory. Other BIOS settings > >>lead me to suppose that NUMA is enabled (or at least not disabled). > >> > >>Booting with Daniel's Xen & kernel does not give any messages about > >>NUMA enabled or disabled. (See attached messages). > >> > >># numactl --show > >>physcpubind: 0 1 2 3 > >>No NUMA support available on this system. > >> > >Are you setting "numa=on dom0_mem=512m" on the kernel line in grub? I'm > >not sure if the dom0_mem=512m should be required but we were having > >problems when trying to boot numa without it. > > Aha, the results are quite a bit better now :-) > > virsh shows the correct topology: > > <topology> > <cells num='2'> > <cell id='0'> > <cpus num='2'> > <cpu id='0'/> > <cpu id='1'/> > </cpus> > </cell> > <cell id='1'> > <cpus num='2'> > <cpu id='2'/> > <cpu id='3'/> > </cpus> > </cell> > </cells> > </topology> > > numactl --show still doesn't work (missing support in dom0 kernel or is > this just completely incompatible with Xen?)
Currently Xen doesn't export any per-domain topology (say a virtual SRAT table), nor the entire system topology; the goal of the current Xen NUMA code is to ensure that domains have local resources within a numa-node. > > 'virsh freecell 0' and 'virsh freecell 1' show numbers which are > plausible (I have no idea if they're actually correct though). > > Can I pin a domain or vCPU to memory to see if that works? > > Rich. > > -- > Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/ > Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod > Street, Windsor, Berkshire, SL4 1TE, United Kingdom. Registered in > England and Wales under Company Registration No. 03798903 > -- > Libvir-list mailing list > Libvir-list@redhat.com > https://www.redhat.com/mailman/listinfo/libvir-list -- Ryan Harper Software Engineer; Linux Technology Center IBM Corp., Austin, Tx (512) 838-9253 T/L: 678-9253 [EMAIL PROTECTED] -- Libvir-list mailing list Libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list
