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    SubjectRe: ZONE_NORMAL memory exhausted by 4000 TCP sockets
    2006/11/6, Zhao Xiaoming <xiaoming.nj@gmail.com>:
    > 2006/11/6, Eric Dumazet <dada1@cosmosbay.com>:
    > > On Monday 06 November 2006 09:59, Zhao Xiaoming wrote:
    > >
    > > > Thank you again for your help. To have more detailed statistic data, I
    > > > did another round of test and gathered some data. I give the overall
    > > > description here and detailed /proc/net/sockstat, /proc/meminfo,
    > > > /proc/slabinfo and /proc/buddyinfo follows.
    > > > =====================================================
    > > > slab mem cost tcp mem pages lowmem
    > > > free with traffic: 254668KB 34693
    > > > 38772KB
    > > > without traffic: 104080KB 1
    > > > 702652KB
    > > > =====================================================
    > >
    > > Thank you for detailed infos.
    > >
    > > It appears you have an extensive use of threads (about 10000), since :
    > >
    > > > task_struct 10095 10095 1360 3 1 : tunables 24 12
    > > > 8 : slabdata 3365 3365 0
    > >
    > > Each thread has a kernel stack, 8KB (ie 2 pages, order-1 allocation), plus a
    > > user vma
    > >
    > > > vm_area_struct 21346 21504 92 42 1 : tunables 120 60
    > > > 8 : slabdata 512 512 0
    > >
    > > Most likely you dont need that much threads. A program with fewer threads will
    > > perform better and use less ram.
    > >
    > >
    > Thanks for the comments. I known the threads may cost many memory.
    > However, I already excluded them from the statistics. The 'after test'
    > info was gotten while the 10000 threads running but no traffics
    > relayed. You may look at the meminfo of 'after test', there is still
    > 104080 kB slab memory which should already included the thread kernel
    > memory cost (8K*10000=80MB). I know 10000 threads are not necessary
    > and just use the simple logic to do some test.
    >
    and I just tried 2500 threads. the results are the same.
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