On 11/6/06, Eric Dumazet <[email protected]> wrote:
On Monday 06 November 2006 10:46, Zhao Xiaoming wrote:
> 2006/11/6, Eric Dumazet <[email protected]>:
> > 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.
In fact, your kernel has CONFIG_4KSTACKS, kernel thread stacks use 4K instead
of 8K.
If you want to increase LOWMEM, (and keep 32bits kernel), you can chose a
2G/2G user/kernel split, instead of the 3G/1G default split.
(see config : CONFIG_VMSPLIT_2G)
Eric
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Thank you for your advice. I know increase LOMEM could be help, but
now my concern is why I lose my 500M bytes memory after excluding all
known memory cost.
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