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AW: FreeBSD not always releasing ACK MBUFs


Hello,

which TCP/IP Stack are you using? FreeBSD or lwIP?

Richard

ITR GmbH
web:     http://www.itrgmbh.com
email:   info@itrgmbh.com
 

> -----UrsprÃngliche Nachricht-----
> Von: ecos-discuss-owner@ecos.sourceware.org [mailto:ecos-discuss-
> owner@ecos.sourceware.org] Im Auftrag von Laurie Gellatly
> Gesendet: Sonntag, 28. April 2013 13:39
> An: ecos-discuss@sourceware.org
> Betreff: [ECOS] FreeBSD not always releasing ACK MBUFs
> 
> Hi All,
> I'm using eCosPro from pre eCos 3.0 to serve web pages with embedded
> images, CSS and javascripts.
> Some pages are set to refresh their content and eventually the application runs
> out of MBUFs and restarts.
> I can use my own web server or the CYGPKG_HTTPD server with the same
> result.
> 
> I used the CYGPKG_HTTPD server on port 81 to monitor network stats.
> What I find is that the âHEADERâ type MBUFs grow and never shrink, eventually
> running out of MBUFs completely.
> The amount of growth in each iteration varies.
> When I dump the data in the HEADER MBUFs (modified support.c to print these
> short MBUFs) and compared them to the network traffic seen by wireshark I
> have confirmed that the HEADERs are correct ACK packets sent at the close of
> various HTTP get sequences.
> For some reason they are not being released.
> 
> I also found that the number of timeout entries (NTIMEOUTS) in timeout.c
> (default 8) is WAY below what is needed (about 70 being used).
> 
> I'm thinking it's something to do with TIME_WAIT not closing the tcpcb when it
> should.
> 
> Has anyone seen this before or can suggest a way to troubleshoot this?
> 
> Thanks			...Laurie:{)
> 
> 
> 
> 
> --
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