Re: [lwip-users] TCP Sessions Scale Limit

[Joel Cunningham]

If you have 128GB of RAM (wow!!!), it might be best to turn off LwIP's 
heap and pool and just use stdc malloc.  Then you won't be limited by 
any pool or heap defines in LwIP.  See the below options:

/**
 * MEM_LIBC_MALLOC==1: Use malloc/free/realloc provided by your C-library
 * instead of the lwip internal allocator. Can save code size if you
 * already use it.
 */
#if !defined MEM_LIBC_MALLOC || defined __DOXYGEN__
#define MEM_LIBC_MALLOC                 0
#endif

/**
 * MEMP_MEM_MALLOC==1: Use mem_malloc/mem_free instead of the lwip pool 
allocator.
 * Especially useful with MEM_LIBC_MALLOC but handle with care 
regarding execution
 * speed (heap alloc can be much slower than pool alloc) and usage from 
interrupts
 * (especially if your netif driver allocates PBUF_POOL pbufs for 
received frames
 * from interrupt)!
 * ATTENTION: Currently, this uses the heap for ALL pools (also for 
private pools,
 * not only for internal pools defined in memp_std.h)!
 */
#if !defined MEMP_MEM_MALLOC || defined __DOXYGEN__
#define MEMP_MEM_MALLOC                 0
#endif

Joel

On 02/27/2018 08:33 AM, Jan Menzel wrote:
> The error is cased by a failed call to memp_malloc(MEMP_TCP_SEG). So
> you're running out of "simultaneously queued TCP segments". Try
> increasing MEMP_NUM_TCP_SEG. Default is 16. Also check the statistics
> more closely. After the protocol related block use pasted the TCP part
> from a memory and memory pool related block follows which contains
> numbers about "TCP_SEG". There you probably have errors as well.
>
>         Jan
>
> On 27.02.2018 15:09, Anil kumar wrote:
> > I have 128 gig RAM , I feel i have been restricted by some macro.
> >
> > tcp_write:779 tcp_write: 0 (with mem err)
> > tcp_create_segment:192 tcp_create_segment: no memory.
> > tcp_write:779 tcp_write: 0 (with mem err)
> > tcp_create_segment:192 tcp_create_segment: no memory.
> > tcp_write:779 tcp_write: 0 (with mem err)
> > tcp_create_segment:192 tcp_create_segment: no memory.
> > tcp_write:779 tcp_write: 0 (with mem err)
> > tcp_create_segment:192 tcp_create_segment: no memory.
> > tcp_write:779 tcp_write: 0 (with mem err)
> > tcp_create_segment:192 tcp_create_segment: no memory.
> > tcp_write:779 tcp_write: 0 (with mem err)
> > tcp_create_segment:192 tcp_create_segment: no memory.
> > tcp_write:779 tcp_write: 0 (with mem err)
> > tcp_create_segment:192 tcp_create_segment: no memory.
> > tcp_write:779 tcp_write: 0 (with mem err)
> > tcp_create_segment:192 tcp_create_segment: no memory.
> > tcp_write:779 tcp_write: 0 (with mem err)
> > tcp_create_segment:192 tcp_create_segment: no memory.
> > tcp_write:779 tcp_write: 0 (with mem err)
> > tcp_create_segment:192 tcp_create_segment: no memory.
> > tcp_write:779 tcp_write: 0 (with mem err)
> > tcp_create_segment:192 tcp_create_segment: no memory.
> > tcp_write:779 tcp_write: 0 (with mem err)
> >
> >
> > address@hidden:~$ cat /proc/meminfo
> > MemTotal:       132024188 kB
> > MemFree:        101949284 kB
> > MemAvailable:   119384708 kB
> > Buffers:         1616608 kB
> > Cached:         15111964 kB
> > SwapCached:            0 kB
> > Active:         11114268 kB
> > Inactive:        8722364 kB
> > Active(anon):    3108632 kB
> > Inactive(anon):     1368 kB
> > Active(file):    8005636 kB
> > Inactive(file):  8720996 kB
> > Unevictable:           0 kB
> > Mlocked:               0 kB
> > SwapTotal:      134205436 kB
> > SwapFree:       134205436 kB
> > Dirty:               548 kB
> > Writeback:             0 kB
> > AnonPages:       3108060 kB
> > Mapped:          2152924 kB
> > Shmem:              1936 kB
> > Slab:            1435644 kB
> > SReclaimable:    1329316 kB
> > SUnreclaim:       106328 kB
> > KernelStack:       10192 kB
> > PageTables:        31252 kB
> > NFS_Unstable:          0 kB
> > Bounce:                0 kB
> > WritebackTmp:          0 kB
> > CommitLimit:    196023224 kB
> > Committed_AS:   34203972 kB
> > VmallocTotal:   34359738367 kB
> > VmallocUsed:           0 kB
> > VmallocChunk:          0 kB
> > HardwareCorrupted:     0 kB
> > AnonHugePages:   2727936 kB
> > CmaTotal:              0 kB
> > CmaFree:               0 kB
> > HugePages_Total:    4096
> > HugePages_Free:     4032
> > HugePages_Rsvd:        0
> > HugePages_Surp:        0
> > Hugepagesize:       2048 kB
> > DirectMap4k:      272572 kB
> > DirectMap2M:    18591744 kB
> > DirectMap1G:    115343360 kB
> > address@hidden:~$
> >
> >
> > On 27 February 2018 at 19:29, Jan Menzel <address@hidden
> > <mailto:address@hidden>> wrote:
> >
> >      On 27.02.2018 14:54, Anil kumar wrote:
> >      [...]
> >      >         memerr: 20829
> >      [...]
> >
> >      You have memory (RAM) problems.
> >
> >              Jan
> >
> >      _______________________________________________
> >      lwip-users mailing list
> >      address@hidden <mailto:address@hidden>
> >      https://lists.nongnu.org/mailman/listinfo/lwip-users
> >      <https://lists.nongnu.org/mailman/listinfo/lwip-users>
> >
> >
> >
> >
> > --
> > With Regards
> > Anil Kumar S N
> >
> >
> > _______________________________________________
> > lwip-users mailing list
> > address@hidden
> > https://lists.nongnu.org/mailman/listinfo/lwip-users
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