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ASSERT: cyg_callout_reset() We didn't pick the smallest delta!


Hello,

I've recently added the FreeBSD networking stack to our port of eCos.
Our device has a PCI interface and I'm using the i82559 driver for an
Intel EtherExpress Pro.

Most of the network tests are running OK, but a few trigger some
asserts in the timeout code.  Since I'm kind of a TCP novice, I'm
wondering if anyone here can give me some insight into what may be
going on here, and where to start digging.

The first assert I saw was the at the end of cyg_callout_reset() in
net/bsd_tcpip/current/src/ecos/timeout.c:

  CYG_ASSERT( delta == last_delta, "We didn't pick the smallest delta!" );

thinking that the trace messages (in buffer mode) may be causing too
much time lag, I disabled tracing.

That seemed to get rid of the problem for the ftp_test, and the
ftp_test now passes,  but for the nc_test_slave it changed a little
but still asserts.  Sometimes it asserts at the same place, but it
also sometimes asserts at the beginning of cyg_callout_reset() at:

  CYG_ASSERT( 0 < delta, "delta is right now, or even sooner!" );

Using tcpdump, I see many (several hundred) packets exchange between
slave and master before the assert.

NOTE: the other net tests run OK, such as flood, ping_test, dhcp_test,
ftp_test, tcp_lo_select, tcp_lo_test, udp_lo_test, ...

Here's an example run of nc_test_slave.  If it helps, I could also
send a tcpdump trace and the output of nc_test_master on linux.

--
Kevin Hilman
Equator Technologies

[cyg_net_init] Init: mbinit(0x00000000)
[cyg_net_init] Init: cyg_net_init_devs(0x00000000)
Init device 'i82559_eth0'
eth0 XXX: driver didn't set ifq_maxlen
[cyg_net_init] Init: loopattach(0x00000000)
[cyg_net_init] Init: ifinit(0x00000000)
IFP: 0x801f0ed0, next: 0x804ba244
IFP: 0x804ba244, next: 0x00000000
[cyg_net_init] Init: domaininit(0x00000000)
[cyg_net_init] Init: cyg_net_add_domain(0x801f4940)
New domain internet at 0x00000000
[cyg_net_init] Init: cyg_net_add_domain(0x801f3940)
New domain route at 0x00000000
[cyg_net_init] Init: cyg_route_init(0x00000000)
[cyg_net_init] Done
Start Network Characterization - SLAVE
BOOTP[eth0] op: REQUEST
       htype: Ethernet
        hlen: 6
        hops: 0
         xid: 0xcd57ffbd
        secs: 0
       flags: 0x80
       hw_addr: 00:02:b3:1b:f1:bd
     client IP: 0.0.0.0
         my IP: 10.0.16.152
     server IP: 10.0.16.20
    gateway IP: 0.0.0.0
  options:
        DHCP message: 3 REQUEST
        DHCP server id: 10.0.16.20
        DHCP time 51: 604800
        DHCP time 58: 302400
        DHCP time 59: 529200
        subnet mask: 255.255.255.0
            gateway: 10.0.16.1
      domain server: 10.0.16.20, 10.0.0.20
        domain name: sea.equator.com
        DHCP option: 37/55.9: 54 51 58 59 1 3 6 15 28
        DHCP option: 39/57.2: 576
        DHCP requested ip: 10.0.16.152
No load = 169425
Set background load = 20% 
Set background load = 0% 
High Load[20] = 167795 => 1% 
Set background load = 20% 
Set background load = 0% 
High Load[40] = 167752 => 1% 
Set background load = 20% 
Set background load = 0% 
High Load[80] = 167874 => 1% 
Set background load = 20% 
Set background load = 0% 
High Load[160] = 166283 => 2% 
Set background load = 20% 
Set background load = 0% 
High Load[320] = 163135 => 4% 
Set background load = 20% 
Set background load = 0% 
High Load[640] = 156687 => 8% 
Set background load = 20% 
Set background load = 0% 
High Load[1280] = 144147 => 15% 
Set background load = 20% 
Set background load = 0% 
High Load[2560] = 118626 => 30% 
Set background load = 20% 
Set background load = 0% 
Load[1920] = 131328 => 23% 
Set background load = 20% 
Set background load = 0% 
Load[1600] = 137666 => 19% 
Set background load = 20% 
Set background load = 0% 
Final load[1684] = 136168 => 20% 
Start test for eth0
TCP echo - 64 buffers, 10240 bytes
connection from 10.0.16.79.50353
ASSERT FAIL: <3>timeout.c[418]cyg_callout_reset() We didn't pick the smallest delta!
ASSERT FAIL: <3>timeout.c           [ 418] cyg_callout_reset()                                                                                  We didn't pick the smallest delta!

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