[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-users] Network stalls


  • To: ddiaz@xxxxxxxx
  • From: Bruce Edge <bruce.edge@xxxxxxxxx>
  • Date: Mon, 21 Jun 2010 10:36:56 -0700
  • Cc: xen-users@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Mon, 21 Jun 2010 10:38:17 -0700
  • Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=rKViLbhbmSrR3vK+/ht11H+KBEobaq7bIWsIhJzKNeKmOKANK36aiHi1eUQbIQJbXb AVO9mQ1H88L4nyTJQydbtRRwyzOxBMSW41+YFIRIiU+RRyvsZA3X+Ijb9MAkGJ+bEj3E Fju/L9LYpNu+3lOKsxZFPCgmjGuu6ea65MabY=
  • List-id: Xen user discussion <xen-users.lists.xensource.com>

On Mon, Jun 21, 2010 at 4:12 AM, David Diaz i Torrico <ddiaz@xxxxxxxx> wrote:

After a bunch of tests and sniffings I found out that the problem was not due to
Xen, it is caused by the 2.6.3x kernels.

It looks like all kernels after 2.6.18 have issues with the congestion control
which make stall the connections at random; Disabling the whole congestion
control stuff, seems to have resolved the problem.



What exactly did you do to disable the congestion control?

-Bruce

 
A Dimarts, 15 de Juny de 2010, David Diaz i Torrico va escriure:
> Hello,
>
> I recently set a new server (a HP Proliant with 2 Quad Xeon 2GHz and 8GB
RAM),
> with a Slackware 13 64Bits, where I installed Xen 4.0, with the kernel
> 2.6.31.13 (the same for dom0 and for domU), and I set up a virtual mail
server
> from which several people retrieve its mail.
>
> When i try to download big files or retrieve big mails from that server, it
> often start to slow down to 4-5Kb/s untill it finally stalls after some
minutes
> of normal download (800-500Kb/s), it doesn't happen nor in the same point of
> download, nor to the same users/computers. A user can try to download a
mail,
> for example, 20 times without any success at all and then suddenly it starts
> to download correctly, and it seems to rarely happen with small mails.
>
> I tried to deactivate the ethernet checksuming, as I've seen to solve the
> problem in former versions, but it gives me an error getting the rx value:
> # ethtool -k eth0
> Offload parameters for eth0:
> Cannot get device rx csum settings: Operation not supported
> rx-checksumming: off
> tx-checksumming: off
>
> By the way, my dmesg has a bunch of these errors:
> "Attempting to checksum a non-TCP/UDP packet, dropping a protocol 1 packet"
> I'm not sure if this is also a related problem or not.
>
> Now I don't have any clue about what or where to look, so, any ideas?
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
>
>

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users

 


Rackspace

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.