Re: [Xen-devel] Re: [b.g.o.358549] blkfront: Move blkif_interrupt into a tasklet.

[Marcin Mirosław <marcin@xxxxxxxx>]

W dniu 24.05.2011 15:13, Konrad Rzeszutek Wilk pisze:
> On Sat, May 21, 2011 at 03:57:13PM +0200, Marcin Mirosław wrote:
>> Hi!
>> I've noticed kernel threads "flush-254:9" does 100%CPU utilization.
>> Device 254-9 is logical volume created via LVM.
>> I don't know if this problem is related to earlier problem, but it
>> happens on the same kernel as mentioned issue.
> 
> What kernel? What is your dom0 kernel and your domU kernel? What
> is the LVM volume? Is it snapshot? Is it on top of a SATA device?
> SSD?

Unfortunately i can't say much about dom0. Admin is very busy and didn't
answer me. I only know domU is placed at one logical volume (lvm).
About domU:
- i didn't noticed any problem with kernels <2.6.37
- with kernels >=2.6.37 i noticed two problems, one of them is mentioned
earlier (WARNING: at block/blk-core.c:239 blk_start_queue+0x20/0x32() ),
second one is "100% of CPU utilization"
- i'm not using lvm snapshot (or other features)
- domU works as PV
-  zgrep -i xen /proc/config.gz
CONFIG_XEN=y
CONFIG_XEN_PVHVM=y
CONFIG_XEN_MAX_DOMAIN_MEMORY=8
CONFIG_XEN_SAVE_RESTORE=y
CONFIG_XEN_BLKDEV_FRONTEND=y
CONFIG_XEN_NETDEV_FRONTEND=y
CONFIG_HVC_XEN=y
CONFIG_XEN_BALLOON=y
CONFIG_XEN_DEV_EVTCHN=y
CONFIG_XENFS=y
CONFIG_XEN_COMPAT_XENFS=y
CONFIG_XEN_SYS_HYPERVISOR=y
CONFIG_XEN_PLATFORM_PCI=m
( kernel: 2.6.36-hardened-r9 )
- grep -i xen /usr/src/linux-2.6.38-hardened-r5/.config | grep -v "^#"
CONFIG_XEN=y
CONFIG_XEN_DOM0=y
CONFIG_XEN_PRIVILEGED_GUEST=y
CONFIG_XEN_PVHVM=y
CONFIG_XEN_MAX_DOMAIN_MEMORY=128
CONFIG_XEN_SAVE_RESTORE=y
CONFIG_PCI_XEN=y
CONFIG_XEN_PCIDEV_FRONTEND=y
CONFIG_XEN_BLKDEV_FRONTEND=y
CONFIG_XEN_NETDEV_FRONTEND=y
CONFIG_HVC_XEN=y
CONFIG_XEN_BALLOON=y
CONFIG_XEN_DEV_EVTCHN=y
CONFIG_XEN_BACKEND=y
CONFIG_XENFS=y
CONFIG_XEN_COMPAT_XENFS=y
CONFIG_XEN_SYS_HYPERVISOR=y
CONFIG_XEN_XENBUS_FRONTEND=y
CONFIG_XEN_PLATFORM_PCI=m
CONFIG_SWIOTLB_XEN=y

(problematic kernel)

> Do give more details please.

I'm sorry for inconvenience.

> And what is 'bgo'? I presume a bugzilla, but you hadn't provided
> a link.
This is gentoo bugzilla: http://bugs.gentoo.org/358549

Regards,
Marcin

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