hugetlbfs

DISCUSSION Yunfeng Zhao 2 participants 3 messages Apr 9, 2008 – Apr 10, 2008 KVM

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Yunfeng Zhao

author

2008-04-09 09:26 UTC #0 lore raw

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.

Anybody knows what the problem is?

thanks
Yunfeng

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Dor Laor

2008-04-09 11:46 UTC #1 lore raw

Quoted 26 lines · Yunfeng Zhao

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)

Quoted 7 lines

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

Quoted 6 lines

Anybody knows what the problem is?
thanks
Yunfeng

Quoted 9 lines

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Yunfeng Zhao

author

2008-04-10 08:17 UTC #2 lore raw

Quoted 37 lines · Dor Laor

Quoted 26 lines · Yunfeng Zhao
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)
Quoted 8 lines
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.

Quoted 6 lines

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

I tried to enable 512MB pages, and then to boot 256M guest. It still fails with the same error.

thanks
Yunfeng

Quoted 6 lines

Quoted 6 lines
Anybody knows what the problem is?
thanks
Yunfeng

Quoted 13 lines

Quoted 10 lines
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