From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dor Laor <dor.laor@qumranet.com>
Subject: Re: hugetlbfs
Date: Wed, 09 Apr 2008 14:46:15 +0300
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To: Yunfeng Zhao <yunfeng.zhao@intel.com>
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On Wed, 2008-04-09 at 17:26 +0800, Yunfeng Zhao wrote:
> Hi,
> I meet problem to get hugetlbfs work on my test box.
> If i added "--mem-path" to qemu, the guest will always fail to boot with 
> the error messages below printed on qemu console:
> ###########################################
> ata0 master: ATA-0 Hard-Disk (  0 MBytes)
> ata1 master: ATAPI-0 Device
> 
> Booting from Hard Disk .....
> Booting from Hard Disk failed: could not read the boot disk
> ##########################################
> 
> And I checked my system, hugepages has been enabled.
> [root@vt-dp8 ~]# grep -i huge /proc/meminfo
> HugePages_Total:   100
> HugePages_Free:     96
> HugePages_Rsvd:      0
> Hugepagesize:     2048 kB
> 
> [root@vt-dp8 ~]# mount
> /dev/sda1 on / type ext3 (rw)
> none on /dev/shm type tmpfs (rw,size=4G)
> nodev on /hugepages type hugetlbfs (rw)
> /dev/sda3 on /share type ext2 (rw)
> /dev/sda2 on /mnt/sda2 type ext3 (rw)
> 
> The command i am using:
> qemu -m 256 -monitor pty -net 
> nic,macaddr=00:16:3e:48:d4:aa,model=rtl8139 -net 
> tap,script=/etc/kvm/qemu-ifup -hda /dev/sda --mem-path /hugepages/
> 
> If I remove "--mem-path", the guest can be booted up.
> 

You have only 96 free 2MB pages, it is less then 256M you asked for the
VM.
you can do 'echo 200 > /proc/sys/vm/nr_hugepages'
HTH,
Dor

> 
> Anybody knows what the problem is?
> 
> thanks
> Yunfeng
> 
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