[Xen-users] XenProject.org Q&A: High ping/latency on guest

[Russ Pavlicek <russell.pavlicek@xxxxxxxxxxxxxx>]

XenProject.org user apit submits the following:

---
I am running Xen 4.1.5 on Linux Ubuntu 12.04 LTS and ping on guest
sometimes is extremely high (see in attachment).

When I was using Xen 4.1.2 ping was high on both - host and guest.

xm info

host                   : server
release                : 3.5.0-44-generic
version                : #67~precise1-Ubuntu SMP Wed Nov 13 16:16:57 UTC 2013
machine                : x86_64
nr_cpus                : 8
nr_nodes               : 1
cores_per_socket       : 4
threads_per_core       : 1
cpu_mhz                : 2992
hw_caps                :
bfebfbff:20100800:00000000:00000940:000ce3bd:00000000:00000001:00000000
virt_caps              :
total_memory           : 32761
free_memory            : 406
free_cpus              : 0
xen_major              : 4
xen_minor              : 1
xen_extra              : .5
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : unavailable
xen_commandline        : placeholder dom0_mem=1024M
cc_compiler            : gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)
cc_compile_by          : stefan.bader
cc_compile_domain      : canonical.com
cc_compile_date        : Tue Dec 17 16:35:34 UTC 2013
xend_config_format     : 4

---

The original post and the attachment apit submitted can be found here:

http://xenproject.org/questions-and-answers/high-ping-latency-on-guest.html

The attachment shows a ping output which averages about 49 ms but
shows a blip of 321 ms before returning to 49 ms.

Any insights?  Please respond to me (so I can crosspost) or visit the
website directly.

Thanks,

Russ

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