[lwip-devel] [bug #31948] httpd: Improving HTTP Server performance when SSI is enabled

[Marcus Hasenstab]

Follow-up Comment #2, bug #31948 (project lwip):

Hi,
I also ran accross this issue on a lwip 1.3.x, running on an STM32F407.

The basic issue is the limited amount of pbufs set in lwipopts.h by
TCP_SND_QUEUELEN. Each tag produces two additional queue entries. For maximum
performance TCP_SND_QUEUELEN should be adjusted for the number of tags used
per shtml-file.

In httpd.c 'http_send_data', during tag-processing len is set to the number of
chars in a the tag, but never reset. This generates lots of calls to
'tcp_write' and thus queue entries.
I added "len = tcp_sndbuf(pcb);  // set len to full remaining buffer size" at
the end of the case TAG_SENDING, when we switch back to 'hs->tag_state =
TAG_NONE'.

Thanks to goldsimon for pointing me in the right direction and for the lwip.

Cheers,
 Marcus




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