lkml.org 
[lkml]   [1996]   [Dec]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectTCP Ack storms with 2.1.13
From
Date


[Crossposted to linux-net]

I found the following behaviour when using TCP/IP:
The produkt i'm using is the Solid database server. The client sets
the receive and tranceive buffers to 8k and does nothing special else
(foudn with strace). The connection from the client and the server
causes a transmission of ACKs from client, so that the load on the
client system is going up to 1, almost exclusivly spent in system time
(xosview).

The tcpdump output is the following (bononunu is the server, loki the client):
20:35:29.827515 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: S 2354387750:2354387750(0) win 512 <mss 1460>
20:35:29.828082 bononunu.gams.co.at.1314 > loki.gams.co.at.1204: S 1766759424:1766759424(0) ack 2354387751 win 4096 <mss 1460>
20:35:29.828202 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 1 win 1460 (DF)
20:35:29.849744 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: P 1:102(101) ack 1 win 1460 (DF)
20:35:29.861893 bononunu.gams.co.at.1314 > loki.gams.co.at.1204: . ack 102 win 4096
20:35:29.928479 bononunu.gams.co.at.1314 > loki.gams.co.at.1204: P 1:36(35) ack 102 win 4096 (DF)
[normal behaviour deleted]
20:35:30.471886 bononunu.gams.co.at.1314 > loki.gams.co.at.1204: . ack 1382 win 4096
20:35:30.478729 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.479016 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.479296 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.479741 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.480020 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.480298 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.480578 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.480956 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.481240 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.481517 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.481794 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.482070 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.482347 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.482626 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.482903 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.483184 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.483462 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.483927 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.484201 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.484638 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.484911 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.485184 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.485457 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.485728 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.485999 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.486369 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.486644 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)
20:35:30.486914 loki.gams.co.at.1204 > bononunu.gams.co.at.1314: . ack 615 win 971 (DF)

and so on, until the next data is transmitted from the server to the
client.
---
g.a.m.s. edv dienstleistungen gmbh
finger mla@murmel.gams.at for PGP key
<http://www.gams.at/~mla>


\
 
 \ /
  Last update: 2005-03-22 13:38    [W:0.071 / U:0.016 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site