On Tue, May 30, 2006 at 10:42:39AM +0300, Pavel Tsekov wrote:
> Someone was complaining about the same issue recently. I think
> he/she was experiencing this long delay on a FreeBSD system. Can
> you give us more details about the system on which you run MC and
> see the long delay ? The output of "mc -V" would be usefull too.
The delay appears before any output generated by -V:
GNU Midnight Commander 4.6.1-pre3
Virtual File System: tarfs, extfs, cpiofs, ftpfs, fish, smbfs
With builtin Editor
Using included S-Lang library with terminfo database
With subshell support as default
With support for background operations
With mouse support on xterm and Linux console
With support for X11 events
With internationalization support
With multiple codepages support
Strace and a tcpdump show that MC is performing DNS requests, the
long timeout is because DNS servers are unreachable.
The requests are for every network interface name, both lowercase
and capitalized. On my test machine it tries to resolve:
lo.
LO.
eth0.
ETH0.
eth1.
ETH1.
eth2.
ETH2.
i.e. every network interface name (loopback and 3 Ethernet).
The DNS query in tcpdump looks like:
IP 127.0.0.1.1074 > 127.0.0.1.53: 21938+ A? LO. (20)
The same delay is experienced if I execute
nslookup lo.
nslookup LO.
...
The question is: why MC is doing DNS queries? Is possible to
disable them?
This is an strace snippet:
connect(4, {sa_family=AF_INET, sin_port=htons(53),
sin_addr=inet_addr("217.19.150.6")}, 28) = 0
send(4, "\272\347\1\0\0\1\0\0\0\0\0\0\4ETH0\0\0\1\0\1", 22, 0)
= 22
gettimeofday({1148978445, 848460}, NULL) = 0
--
Niccolo Rigacci
Firenze - Italy
Iraq, missione di pace: 38059 morti - www.iraqbodycount.net
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