I''m new to opensolaris, and i''m really loving it so far. naturally, i''d like to try running XEN on my box. This box is mainly a NAS, but i can''t get rtorrent installed, so i''m hoping XEN will be the answer. I''m reading some of the documentation of it and it''s saying i need to lower my arc, i''m wondering how much? I only plan on running a single domU and i only plan on running a small webserver in that with rtorrent. I have an intel q9550 cpu with VT-d enabled, and 8 gb of ddr2 ECC ram I don''t see any guidelines for how much to limit arc, just this: set zfs:zfs_arc_max = 0x10000000 That seems quite low.....does it really need to be this low? -- This message posted from opensolaris.org
On 01/23/10 07:03 PM, Thomas Burgess wrote:> I''m new to opensolaris, and i''m really loving it so far. > > naturally, i''d like to try running XEN on my box. This box is mainly a NAS, but i can''t get rtorrent installed, so i''m hoping XEN will be the answer. I''m reading some of the documentation of it and it''s saying i need to lower my arc, i''m wondering how much? > > I only plan on running a single domU and i only plan on running a small webserver in that with rtorrent. > > I have an intel q9550 cpu with VT-d enabled, and 8 gb of ddr2 ECC ram > > I don''t see any guidelines for how much to limit arc, just this: > set zfs:zfs_arc_max = 0x10000000 > > > That seems quite low.....does it really need to be this low? >It depends on how much ram you have and how many VMs with how many mem ! Anyway I''m not quite sure this is still necessary since the default now limits dom0_mem to 2048K or 1/2 the system mem and I understood, arc_cache_mem to 3/4 of this value... Bruno PS I keep it at 0x20000000 for my system with 8192M mem, dom0 6144M and 1 VM 2048M
On Jan 23, 2010, at 12:09 PM, Bruno Damour wrote:> On 01/23/10 07:03 PM, Thomas Burgess wrote: >> I''m new to opensolaris, and i''m really loving it so far. >> >> naturally, i''d like to try running XEN on my box. This box is mainly a NAS, but i can''t get rtorrent installed, so i''m hoping XEN will be the answer. I''m reading some of the documentation of it and it''s saying i need to lower my arc, i''m wondering how much? >> >> I only plan on running a single domU and i only plan on running a small webserver in that with rtorrent. >> >> I have an intel q9550 cpu with VT-d enabled, and 8 gb of ddr2 ECC ram >> >> I don''t see any guidelines for how much to limit arc, just this: >> set zfs:zfs_arc_max = 0x10000000 >> >> >> That seems quite low.....does it really need to be this low? >> > It depends on how much ram you have and how many VMs with how many mem ! > Anyway I''m not quite sure this is still necessary since the default now limits dom0_mem to 2048K or 1/2 the system mem and I understood, arc_cache_mem to 3/4 of this value... > Bruno > > PS I keep it at 0x20000000 for my system with 8192M mem, dom0 6144M and 1 VM 2048M > _______________________________________________ > xen-discuss mailing list > xen-discuss@opensolaris.orgHere are the steps I followed on my systems.. with 64GB of ram. http://wikis.sun.com/display/OpenIT/Prepare+physical+machines+to+be+xVM+dom0 ... but I just noticed I missed that step on my documentation, d''oh! .. here is the lines from /etc/system * ZFS Tuning for XEN (1.5G) set zfs:zfs_arc_max = 0x60000000