Re: [Xen-users] High response time with domUs

[Stephan Seitz <s.seitz@xxxxxxxxxxxx>]

Daniel Bareiro schrieb:
> Hi all!
> 
> I'm testing my new DNS server mounted on a domU in my home LAN and I've
> noticed a import delay in the time response for the host in my LAN
> (domUs and non domUs), but the response time of external hosts is
> minimum. 

Hi,

try to disable transmission checksum on you domU's NIC

domU# ethtool -K eth0 tx off

and see if this solves your issue.

Regards,

Stephan



> viper@marian:~$ ping -c5 debian
> PING ws1.daninet (192.168.1.5) 56(84) bytes of data.
> 64 bytes from 192.168.1.5: icmp_seq=1 ttl=64 time=0.187 ms
> 64 bytes from 192.168.1.5: icmp_seq=2 ttl=64 time=0.146 ms
> 64 bytes from 192.168.1.5: icmp_seq=3 ttl=64 time=0.156 ms
> 64 bytes from 192.168.1.5: icmp_seq=4 ttl=64 time=0.197 ms
> 64 bytes from 192.168.1.5: icmp_seq=5 ttl=64 time=0.140 ms
> 
> - --- ws1.daninet ping statistics ---
> 5 packets transmitted, 5 received, 0% packet loss, time 20014ms
>                                                         ^^^^^^^
> 
> rtt min/avg/max/mdev = 0.140/0.165/0.197/0.024 ms
> 
> 
> viper@marian:~$ ping -c5 yahoo.com
> PING yahoo.com (66.94.234.13) 56(84) bytes of data.
> 64 bytes from w2.rc.vip.scd.yahoo.com (66.94.234.13): icmp_seq=1 ttl=52 
> time=212 ms
> 64 bytes from w2.rc.vip.scd.yahoo.com (66.94.234.13): icmp_seq=2 ttl=51 
> time=212 ms
> 64 bytes from w2.rc.vip.scd.yahoo.com (66.94.234.13): icmp_seq=3 ttl=50 
> time=212 ms
> 64 bytes from w2.rc.vip.scd.yahoo.com (66.94.234.13): icmp_seq=4 ttl=51 
> time=213 ms
> 64 bytes from w2.rc.vip.scd.yahoo.com (66.94.234.13): icmp_seq=5 ttl=50 
> time=213 ms
> 
> --- yahoo.com ping statistics ---
> 5 packets transmitted, 5 received, 0% packet loss, time 4016ms
>                                                         ^^^^^^
> rtt min/avg/max/mdev = 212.161/213.056/213.980/0.872 ms
> 
> viper@marian:~$ dig debian.daninet
> 
> ; <<>> DiG 9.4.2 <<>> debian.daninet
> ;; global options:  printcmd
> ;; Got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 39161
> ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 1, ADDITIONAL: 0
> 
> ;; QUESTION SECTION:
> ;debian.daninet.                        IN      A
> 
> ;; ANSWER SECTION:
> debian.daninet.         3600    IN      CNAME   ws1.daninet.
> ws1.daninet.            3600    IN      A       192.168.1.5
> 
> ;; AUTHORITY SECTION:
> daninet.                3600    IN      NS      ns1.daninet.
> 
> ;; Query time: 3 msec
> ;; SERVER: 192.168.1.6#53(192.168.1.6)
> ;; WHEN: Mon Dec 10 19:40:17 2007
> ;; MSG SIZE  rcvd: 84
> 
> This behavior can be due to DNS server is mounted on a domU?
> 
> Thanks in advance.
> 
> Regards,
> Daniel
> 
> 
> ------------------------------------------------------------------------
> 
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-- 
Stephan Seitz
Senior System Administrator

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