[Xen-users] High response time with domUs

[Daniel Bareiro <daniel-listas@xxxxxxx>]

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. 

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
-- 
Daniel Bareiro - System Administrator
Fingerprint: BFB3 08D6 B4D1 31B2 72B9  29CE 6696 BF1B 14E6 1D37
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