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[lwip-devel] [bug #49218] pbuf_clen() overflow as a result of tcp_write
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From: |
Simon Goldschmidt |
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Subject: |
[lwip-devel] [bug #49218] pbuf_clen() overflow as a result of tcp_write concatenation |
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Date: |
Fri, 30 Sep 2016 10:22:15 +0000 (UTC) |
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User-agent: |
Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36 |
Follow-up Comment #5, bug #49218 (project lwip):
> As far as I can tell, there is no way to prevent creating that
> many reference pbufs if an application decides to do "for(;;)
> write(fd,"y\n",2);"
There is: socket writes use TCP_WRITE_FLAG_COPY.
And that was my point: I don't expect you have a scatter-gather-MAC that
supports TX frames with that many chunks. Being like that, you probably end up
copying all bytes per CPU anyway. Thus, I don't see the advantage of doing it
with ref pbufs. On the contrary, it's probably less performant.
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