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

To: Xen-Users <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] High response time with domUs
From: Georg Fleckenstein <georg.fleckenstein@xxxxxx>
Date: 2007年12月17日 19:55:52 +0100
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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.
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
Hello Daniel,
first you should ping to IP-Addresses to 192.168.1.6 and 192.168.1.5 without any name resolution.
There is ab big delay, but your responsetime seems to be lower than 0.2 ms.
it seems to be a problem with dns configuration.
Georg
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