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xen-users
RE: [Xen-users] Memory Allocation
Here is the disk stats
avg-cpu: %user %nice %system %iowait %steal %idle
1.13 0.00 0.21 0.06 0.04 98.58
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz
avgqu-sz await svctm %util
sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00
sda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00
sda2 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00
sda3 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00
sdb 0.00 38.33 0.00 25.33 0.00 0.23 18.53
0.12 4.16 0.58 1.47
sdb1 0.00 38.33 0.00 25.33 0.00 0.23 18.53
0.12 4.16 0.58 1.47
avg-cpu: %user %nice %system %iowait %steal %idle
1.15 0.00 0.18 0.60 0.04 98.02
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz
avgqu-sz await svctm %util
sda 0.00 9.30 0.00 18.27 0.00 0.11 12.22
1.52 83.13 2.84 5.18
sda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00
sda2 0.00 9.30 0.00 18.27 0.00 0.11 12.22
1.52 83.13 2.84 5.18
sda3 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00
sdb 0.00 19.93 1.33 22.26 0.00 0.19 17.24
0.85 36.68 2.70 6.38
sdb1 0.00 19.93 1.00 22.26 0.00 0.19 17.49
0.85 37.20 2.74 6.38
sdb1 is the iSCSI volume. I used the free -o -m command to show that memory was
consumed at the point. Now it is possible the vm's could have started paging
and that causes the performance problem I saw. But either way I really just
need to understand how the memory assignment /allocation works in Xen so I can
determine where my memory is going. Because with my math I should be getting
more that 40 machines on a server with 147GB of ram
so here is a few memory snapshots at the moment: As here you can see different
commands for memory list different responses. Where did my 147GB go?
vmc1n2:~ # free
total used free shared buffers cached
Mem: 131402752 19008992 112393760 0 401988 14859640
-/+ buffers/cache: 3747364 127655388
Swap: 2618584 0 2618584
vmc1n2:~ # free -o -m
total used free shared buffers cached
Mem: 128323 18563 109759 0 392 14511
Swap: 2557 0 2557
vmc1n2:~ #
xentop - 12:10:57 Xen 3.3.1_18546_20-0.1
30 domains: 1 running, 28 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown
Mem: 150984932k total, 148800660k used, 2184272k free CPUs: 16 @ 2394MHz
-----Original Message-----
From: Fajar A. Nugraha [mailto:fajar@xxxxxxxxx]
Sent: Monday, February 15, 2010 11:25 AM
To: Joseph Coleman
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Memory Allocation
On Mon, Feb 15, 2010 at 11:42 PM, Joseph Coleman
<joe.coleman@xxxxxxxxxxxxxxxxxx> wrote:
> All of our VM'S are Windows based and assigned 512 MB with the ability to
> go up to 1024 MB.
Can HVM domUs balloon up memory? Not the last time I check. Have you tried it?
> I seem to be maxing out
> at 39 to 40 machines and then performance is horrible and it appears I may
> be out of ram.
And how did you determine they are out of ram?
I'm more inclined to think that disk I/O is your problem. Try "iostat
-mx 3" on dom0.
--
Fajar
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