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X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB4PR07MB0528 X-IsSubscribed: yes Subject: Re: [ECOS] max IP packet size = 9216 B. Why? X-SW-Source: 2017-06/txt/msg00000.txt.bz2 Hi, It is a implicit limitation of eCos: to limit the amount of RAM needed, the maximum IP packet size is 9kB. This is hardcoded in the eCos code, so I changed it there. I don't remember where, but when I find it, I will mail you again. Kind regards, Jürgen On 05/04/2017 02:55 AM, lawshere@gmail.com wrote: > is there any patch for it, > no matter how i set SNDBUF, the problem is still, > it seems the maximum accessable size for one udp packet is the same as > MTU. > > 在 2007年6月12日星期二 UTC+8下午11:49:30,Jürgen Lambrecht写道: > > Hello, > > I found out that the maximum IP packet size = 9216 B (0x2400). > I implemented an echo program, both udp and tcp. > My ecos applic can receive more that 9216B, but not send back more > than > that. > > Has anybody a clue how to solve this? > I need to support the maximum IP packet size of 65535 B > (IP_MAXPACKET). > I don't know if this is a bug in ecos, or a (hidden?) limitation > of an > embedded OS. > > Thanks, > Juergen Lambrecht > > P.S.: > I'm busy tracing this back in the source > This comes from the socket that is allocated statically in > /io/fileio/.../fd.cxx and socket is part of a cyg_file (cyg_file is > defined by file in file.h). In cyg_file there is a member f_data, > which > is the socket. > I'm continuing my search in the code at this point.... > > -- > Jürgen Lambrecht > R&D Engineer > Televic Transport Systems > http://www.televic.com > Televic NV / SA (main office) > Leo Bekaertlaan 1 > B-8870 Izegem > Tel: +32 (0)51 303045 > Fax: +32 (0)51 310670 > > > -- > Before posting, please read the FAQ: > http://ecos.sourceware.org/fom/ecos > > and search the list archive: > http://ecos.sourceware.org/ml/ecos-discuss > > -- Jürgen Lambrecht R&D Associate Mobile: +32 499 644 531 Twitter: JGRLambrecht Tel: +32 (0)51 303045 Fax: +32 (0)51 310670 http://www.televic-rail.com https://www.facebook.com/TelevicRail Televic Rail NV - Leo Bekaertlaan 1 - 8870 Izegem - Belgium Company number 0825.539.581 - RPR Kortrijk This electronic transmission is intended exclusively for the person or entity to whom it is addressed and may contain confidential and/or privileged material. Any disclosure, copying, distribution or other action based upon the information by persons or entities other than the intended recipient is prohibited. All e-mail correspondence from Televic Rail NV is only intended for information purposes and can not result in contractual obligations. Commitments under Televic Rail NV can only occur through regular exchange of letters, signed by authorized persons in accordance with publication in the Belgian Official Gazette. -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss