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SubjectRe: ZONE_NORMAL memory exhausted by 4000 TCP sockets
Date
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.

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