slow "KVM Host" in EL6 ?
Ben
bda20 at cam.ac.uk
Fri May 13 13:07:45 UTC 2011
On Fri, 13 May 2011, Paul N wrote:
> On Thu, May 12, 2011 at 3:30 PM, Ben <bda20 at cam.ac.uk> wrote:
>> On Thu, 12 May 2011, Dmitry Makovey wrote:
>>
>>> we have some weird problem with EL6 box which serves as a KVM host for 3
>>> VMs currently. It shares the same interface with all 3 VMs (same network).
>>> All works, except from time to time machine behaves very slow in console
>>> (ok, SSH connection) and it happens only from time to time.
>>> [...]
>>
>> It may be unconnected but I have a RHEL6 box which also occasionally has
>> an issue with slow SSH connection. By that I mean you type "ssh
>> rhel6host", the password prompt comes up quickly, but after entering the
>> password and hitting return there's a palpable delay (sometimes) before
>> the prompt appears. Not every time, but often. Sometimes as long as
>> four to five seconds. A RHEL6 KVM guest I installed on it also has the
>> same issue (sometimes). I've run ssh with -vvv and sshd with -vvv and
>> not seen anything untoward. DNS is on the local LAN and reports no
>> issues either. All connections are from RHEL5 hosts. Just somtimes
>> connection is... slow.
>
> I've seen the problem you've described when I have a bogus entry for
> localhost (or an incorrect IP address for the server's FQDN) in
> /etc/hosts. YYMV of course!
/etc/hosts:
10.1.1.158 knife.internal.admin.cam.ac.uk knife # Added by NetworkManager
127.0.0.1 localhost.localdomain localhost
::1 knife.internal.admin.cam.ac.uk knife localhost6.localdomain6 localhost6
Ben
--
Unix Support, MISD, University of Cambridge, England
Plugger of wire, typer of keyboard, imparter of Clue
Life Is Short. It's All Good.
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