Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.arch.embedded > #28867

Re: High packet rate ethernet with LwIP

Show all headers | View raw

On 2019-09-25 David Brown wrote in comp.arch.embedded:
...
> What are your other lwip config numbers?  I have:
>
> #define MEM_SIZE                (48*1024)
> #define MEMP_NUM_PBUF           32
> #define MEMP_NUM_UDP_PCB        6
> #define MEMP_NUM_TCP_PCB        128
> #define MEMP_NUM_TCP_PCB_LISTEN 8
> #define MEMP_NUM_TCP_SEG        16
> #define MEMP_NUM_SYS_TIMEOUT    10
> #define PBUF_POOL_SIZE          32
> #define PBUF_POOL_BUFSIZE       1518

In lwipopt.h:
#define MEM_SIZE                        (32 * 1024)
#define MEMP_NUM_SYS_TIMEOUT            300
#define PBUF_POOL_SIZE                  64

Most were not in my lwipopt.h, so at default from opt.h:
#define MEMP_NUM_PBUF                   16
#define MEMP_NUM_UDP_PCB                4
#define MEMP_NUM_TCP_PCB                5
#define MEMP_NUM_TCP_PCB_LISTEN         8
#define MEMP_NUM_TCP_SEG                16
#define PBUF_POOL_BUFSIZE               LWIP_MEM_ALIGN_SIZE(TCP_MSS+40+PBUF_LINK_HLEN)

The last one expands to: ((1460+40+14)+3) & ~3 = 1516

> I can't say I have studied the usage in detail, so I might have much
> more than I need for some of these.  But if any of your values are
> hugely lower than mine, check them to be sure.  /Something/ is giving
> you memory allocation errors, and you need to find and fix that something.

Tried changing MEMP_NUM_TCP_PCB, MEMP_NUM_PBUF and
MEMP_NUM_SYS_TIMEOUT to your values, but no change in behaviour.

> It is also possible that the rest of program structure means you are
> getting slow handling of the packets - I can't guess anything about
> that, because I don't know your code at all.

It's just a loop calling the lwip handlers (the standard stand alone
echo example) and a function that checks a timer for when to send a
(dummy) packet. So really lightweight, just to test if I can get packets
out at the required rate.

I'm giving up the TCP version for now and go with the UDP, which seems
to work fine (with the same settings). I'll give TCP another try some
time.

-- 
Stef    (remove caps, dashes and .invalid from e-mail address to reply by mail)

No hardware designer should be allowed to produce any piece of hardware
until three software guys have signed off for it.
		-- Andy Tanenbaum

Back to comp.arch.embedded | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

High packet rate ethernet with LwIP Stef <stef33d@yahooI-N-V-A-L-I-D.com.invalid> - 2019-09-20 18:27 +0200
  Re: High packet rate ethernet with LwIP upsidedown@downunder.com - 2019-09-20 21:20 +0300
    Re: High packet rate ethernet with LwIP Stef <stef33d@yahooI-N-V-A-L-I-D.com.invalid> - 2019-09-23 10:37 +0200
      Re: High packet rate ethernet with LwIP Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2019-09-23 14:08 +0300
      Re: High packet rate ethernet with LwIP Richard Damon <Richard@Damon-Family.org> - 2019-09-23 07:13 -0400
        Re: High packet rate ethernet with LwIP Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2019-09-23 18:55 +0300
      Re: High packet rate ethernet with LwIP David Brown <david.brown@hesbynett.no> - 2019-09-23 14:04 +0200
        Re: High packet rate ethernet with LwIP Dimiter_Popoff <dp@tgi-sci.com> - 2019-09-23 17:03 +0300
          Re: High packet rate ethernet with LwIP David Brown <david.brown@hesbynett.no> - 2019-09-23 18:37 +0200
            Re: High packet rate ethernet with LwIP Stef <stef33d@yahooI-N-V-A-L-I-D.com.invalid> - 2019-09-24 14:22 +0200
              Re: High packet rate ethernet with LwIP upsidedown@downunder.com - 2019-09-25 07:55 +0300
                Re: High packet rate ethernet with LwIP David Brown <david.brown@hesbynett.no> - 2019-09-25 09:51 +0200
                Re: High packet rate ethernet with LwIP Stef <stef33d@yahooI-N-V-A-L-I-D.com.invalid> - 2019-09-25 16:03 +0200
                Re: High packet rate ethernet with LwIP Stef <stef33d@yahooI-N-V-A-L-I-D.com.invalid> - 2019-09-25 11:59 +0200
                Re: High packet rate ethernet with LwIP Stef <stef33d@yahooI-N-V-A-L-I-D.com.invalid> - 2019-09-25 13:16 +0200
              Re: High packet rate ethernet with LwIP David Brown <david.brown@hesbynett.no> - 2019-09-25 09:42 +0200
                Re: High packet rate ethernet with LwIP Stef <stef33d@yahooI-N-V-A-L-I-D.com.invalid> - 2019-09-25 13:41 +0200
                Re: High packet rate ethernet with LwIP David Brown <david.brown@hesbynett.no> - 2019-09-25 14:10 +0200
                Re: High packet rate ethernet with LwIP Stef <stef33d@yahooI-N-V-A-L-I-D.com.invalid> - 2019-09-25 15:22 +0200
      Re: High packet rate ethernet with LwIP upsidedown@downunder.com - 2019-09-23 22:26 +0300
        Re: High packet rate ethernet with LwIP Stef <stef33d@yahooI-N-V-A-L-I-D.com.invalid> - 2019-09-23 22:16 +0200
          Re: High packet rate ethernet with LwIP David Brown <david.brown@hesbynett.no> - 2019-09-23 23:08 +0200
  Re: High packet rate ethernet with LwIP Joe Chisolm <jchisolm6@earthlink.net> - 2019-09-20 13:44 -0500
    Re: High packet rate ethernet with LwIP Stef <stef33d@yahooI-N-V-A-L-I-D.com.invalid> - 2019-09-23 10:46 +0200
  Re: High packet rate ethernet with LwIP David Brown <david.brown@hesbynett.no> - 2019-09-21 19:00 +0200
    Re: High packet rate ethernet with LwIP upsidedown@downunder.com - 2019-09-22 00:01 +0300
      Re: High packet rate ethernet with LwIP David Brown <david.brown@hesbynett.no> - 2019-09-22 09:06 +0200
        Re: High packet rate ethernet with LwIP upsidedown@downunder.com - 2019-09-22 11:29 +0300
          Re: High packet rate ethernet with LwIP David Brown <david.brown@hesbynett.no> - 2019-09-22 23:24 +0200
        Re: High packet rate ethernet with LwIP Stef <stef33d@yahooI-N-V-A-L-I-D.com.invalid> - 2019-09-23 11:10 +0200
    Re: High packet rate ethernet with LwIP Stef <stef33d@yahooI-N-V-A-L-I-D.com.invalid> - 2019-09-23 11:03 +0200

csiph-web