[Xen-users] Remus dom0 network buffering

[Andrew Eross <eross@xxxxxxxxxxxx>]

Hi Shriram,

I had another question for you if you don't mind -

I've been experimenting with a Ubuntu 12.10 dom0 running Xen 4.1.4 and using Remus with DRBD.

I'm writing it all up and will post up my findings on our blog as well... once I figure it out =).

I can run Remus successfully now in fact, transitioning VMs from one test machine to another with DRBD, but only when I use "--no-net".

If I run "remus -i 40 --no-net rt left" this works.

If I run "remus -i 40 rt left", I get the below:

WARNING: suspend event channel unavailable, falling back to slow xenstore signalling

PROF: suspending at 1361224385.607101

installing buffer on ifb0... RTNETLINK answers: Invalid argument

xc: error: Suspend request failed: Internal error

xc: error: Domain appears not to have suspended: Internal error

PROF: resumed at 1361224385.618021

Traceback (most recent call last):

  File "/usr/bin/remus", line 219, in <module>

    run(cfg)

  File "/usr/bin/remus", line 205, in run

    for buf in bufs:

  File "/usr/bin/remus", line 142, in postsuspend

    buf.postsuspend()

  File "/usr/lib/python2.7/dist-packages/xen/remus/device.py", line 333, in postsuspend

    self.install()

  File "/usr/lib/python2.7/dist-packages/xen/remus/device.py", line 380, in install

    self.rth.talk(req.pack())

  File "/usr/lib/python2.7/dist-packages/xen/remus/netlink.py", line 318, in talk

    self._rth.talk(req)

IOError: error sending message

My /etc/modules contains:

sch_plug

sch_prio

sch_ingress

cls_basic

cls_tcindex

cls_u32

act_mirred

ifb

I was under the impression that "ifb" and "sch_plug" were the key items required, but I'm not quite sure - all the online materials are a bit mixed in their explanations on this point.

For further information, here's my system's modules:

root@right:/home/eross# lsmod

Module                  Size  Used by

ifb                    12897  0 

xt_physdev             12588  4 

iptable_filter         12811  1 

ip_tables              26996  1 iptable_filter

x_tables               29757  3 xt_physdev,iptable_filter,ip_tables

xen_netback            27434  0 [permanent]

xen_blkback            23041  0 [permanent]

xen_gntdev             17391  0 

xen_evtchn             13221  3 

xenfs                  12986  1 

xen_privcmd            13081  16 xenfs

bridge                 90447  0 

stp                    12977  1 bridge

llc                    14553  2 bridge,stp

coretemp               13401  0 

snd_hda_codec_via      46676  1 

ghash_clmulni_intel    13221  0 

cryptd                 20404  1 ghash_clmulni_intel

eeepc_wmi              13110  0 

asus_wmi               24089  1 eeepc_wmi

sparse_keymap          13891  1 asus_wmi

microcode              22804  0 

psmouse                95595  0 

serio_raw              13216  0 

ext2                   72881  1 

act_mirred             13039  1 

mac_hid                13206  0 

cls_u32                17138  1 

cls_tcindex            13059  0 

cls_basic              12947  0 

sch_ingress            12867  1 

wmi                    19071  1 asus_wmi

sch_prio               13153  0 

sch_plug               12655  0 

drbd                  300253  4 

snd_hda_intel          33492  0 

lpc_ich                17062  0 

snd_hda_codec         134213  2 snd_hda_codec_via,snd_hda_intel

snd_hwdep              17699  1 snd_hda_codec

snd_pcm                96668  2 snd_hda_intel,snd_hda_codec

snd_timer              29426  1 snd_pcm

snd                    78921  6 snd_hda_codec_via,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_timer

soundcore              15048  1 snd

i915                  520621  1 

snd_page_alloc         18485  2 snd_hda_intel,snd_pcm

mei                    40691  0 

drm_kms_helper         49113  1 i915

drm                   288721  2 i915,drm_kms_helper

lp                     17760  0 

parport                46346  1 lp

i2c_algo_bit           13414  1 i915

video                  19336  1 i915

r8169                  61651  0 

root@right:/home/eross# uname -a

Linux right 3.5.0-23-generic #35-Ubuntu SMP Thu Jan 24 13:15:40 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

Thanks!

Andrew

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