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Replies:
2
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Last Post:
Jun 23, 2008 5:07 AM
by: mdemarco
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Posts:
365
From:
Registered:
7/5/06
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VirtualBox on zfs
Posted:
Jun 23, 2008 4:37 AM
To: OpenSolaris » discuss
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Just a note to hopefully help someone else out.
I have been running VirtualBox on my sager laptop inside zfs partition with 2Gbytes of ram build 82. Even though I had the Guest OS set to 600Meg. (WindowsXP) MY memory would keep dropping until I started seeing performance problems. I added another 2Gbyte of ram to the system but this only delayed the performance problem. I thought that it might have been a memory leak with VirtualBox but the process memory usage never grew.
I found the problem to be zfs cache. I believe this was caused by the large file size of VirtualBox and that ZFS cache keeps trying to bring it into memory. I have limited zfs cache down to 1Gbyte using the following line in /etc/system
set zfs:zfs_arc_max = 0x3E800000
The performance problems went away and VirtualBox is still happy.
Hope this is help to someone.
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Posts:
94
From:
CZ
Registered:
4/2/08
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Re: VirtualBox on zfs
Posted:
Jun 23, 2008 5:07 AM
in response to: mdemarco
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Hi,
On Mon, Jun 23, 2008 at 04:37:36AM -0700, Mike DeMarco wrote:
> Just a note to hopefully help someone else out.
>
> I have been running VirtualBox on my sager laptop inside zfs partition with 2Gbytes of ram build 82. Even though I had the Guest OS set to 600Meg. (WindowsXP) MY memory would keep dropping until I started seeing performance problems. I added another 2Gbyte of ram to the system but this only delayed the performance problem. I thought that it might have been a memory leak with VirtualBox but the process memory usage never grew.
>
> I found the problem to be zfs cache. I believe this was caused by the large file size of VirtualBox and that ZFS cache keeps trying to bring it into memory. I have limited zfs cache down to 1Gbyte using the following line in /etc/system
> set zfs:zfs_arc_max = 0x3E800000
>
> The performance problems went away and VirtualBox is still happy.
>
> Hope this is help to someone.
Just generally about "ZFS Evil"; check following page:
http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide
/j.
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Posts:
365
From:
Registered:
7/5/06
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Re: VirtualBox on zfs
Posted:
Jun 23, 2008 5:54 AM
in response to: jf_
To: OpenSolaris » discuss
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>
> Just generally about "ZFS Evil"; check following
> g page:
> http://www.solarisinternals.com/wiki/index.php/ZFS_Ev
> il_Tuning_Guide
>
> /j.
>
Yes the tuning guide was a great help in tracking down this problem.
Note:
Some of the kernel debugging suggestions do not work. Here is one of them.
mdb -kw
Loading modules: [ unix genunix specfs dtrace cpu.generic uppc pcplusmp scsi_vhci ufs ip hook neti sctp arp usba uhci s1394 nca fctl lofs zfs random md audiosup cpc fcip crypto ptm nsctl sppp nfs ipc ]
> arc::print -a p c c_max
mdb: failed to dereference symbol: unknown symbol name
>
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