Re: [BUG] 2.2.19 -> 80% Packet Loss

From: Tim Moore (timothymoore@bigfoot.com)
Date: Fri Jun 15 2001 - 04:12:59 EST

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José Luis Domingo López wrote:
>
> On Thursday, 14 June 2001, at 14:17:11 -0700,
> chuckw@altaserv.net wrote:
>
> >
> > 1. When pinging a machine using kernel 2.2.19 I consistently get an 80%
> > packet loss when doing a ping -f with a packet size of 64590 or higher.
> >
> What happens here is (under kernel 2.2.19):
> ping -f -s 49092 localhost -->> 0 % packet loss
> ping -f -s 49093 localhost -->> 100 % packet loss

[tim@abit cron.daily]# ping -w 10 -f -s 49093 localhost
PING localhost (127.0.0.1) from 127.0.0.1 : 49093(49121) bytes of data.
Warning: no SO_RCVTIMEO support, falling back to poll
.
--- localhost ping statistics ---
8051 packets transmitted, 8051 packets received, 0% packet loss
round-trip min/avg/max/mdev = 0.517/0.751/25.336/0.678 ms

> Maybe this has something to do with fragmentation of IP packets to fit in
> the underlying protocol's MTU (3929 in my loopback device).

[tim@abit cron.daily]# ifconfig lo
lo Link encap:Local Loopback
          inet addr:127.0.0.1 Mask:255.0.0.0
          UP LOOPBACK RUNNING MTU:3924 Metric:1
          RX packets:1197462 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1197462 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0

[tim@abit cron.daily]# cat /proc/version
Linux version 2.2.20p2-ai (root@abit) (gcc version egcs-2.91.66
19990314/Linux (egcs-1.1.2 release)) #12 Fri May 25 16:31:02 PDT 2001

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Next message: Ivan Schreter: "Re: Buffer management - interesting idea"
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