linux-2.6-rt patch on ppc85xx and OOM messages

[emre kara]

The OOM messages disappeared but the ethernet
throughput decreased significantly (90MBit for
1518Byte packet, and throughput without the patch is
about 900Bits) and the system can't manage load
balancing between to interfaces,the system acts like
the priorty of tsec0 is higher then tsec1 because of
this, the heavy load on tsec0 blocks packet receiving
on tsec1.
--- Kumar Gala <galak at kernel.crashing.org> wrote:

> 
> On Mar 29, 2006, at 12:45 AM, emre kara wrote:
> 
> > Dear All,
> > Is Ingo Molnar's realtime-preempt patch compatible
> > with ppc, or is there any work on a porting effort
> of
> > this patch ? I have made some tests on a 85xx
> machine
> > with this patch, under heavy load on ethernet
> > interfaces, thw system prints OOM messages on
> console
> > and hangs..
> > Thanks.
> 
> Can you try setting the gfar interrupts to
> SA_INTERRUPT and see what  
> happens.
> 
> - k
> 
> > --------------------------console output-----
> > softirq-net-rx/: page allocation failure. order:0,
> > mode:0x20
> > Call Trace:
> > [C04E3DB0] [C000A60C] show_stack+0x50/0x188
> > (unreliable)
> > [C04E3DE0] [C004C3EC] __alloc_pages+0x1c8/0x2a4
> > [C04E3E30] [C0063C90]
> cache_alloc_refill+0x35c/0x57c
> > [C04E3E80] [C0063FA4] __kmalloc+0xf4/0xfc
> > [C04E3EB0] [C012D460] __alloc_skb+0x58/0x118
> > [C04E3ED0] [C011AF20] gfar_new_skb+0x40/0xd4
> > [C04E3EF0] [C011D320]
> gfar_clean_rx_ring+0x25c/0x634
> > [C04E3F30] [C011D72C] gfar_poll+0x34/0x140
> > [C04E3F50] [C013364C] net_rx_action+0x94/0x188
> > [C04E3F80] [C0026730] ksoftirqd+0x104/0x1b4
> > [C04E3FC0] [C003779C] kthread+0xf8/0x100
> > [C04E3FF0] [C0004DB8] kernel_thread+0x44/0x60
> > Mem-info:
> > DMA per-cpu:
> > cpu 0 hot: high 90, batch 15 used:0
> > cpu 0 cold: high 30, batch 7 used:0
> > DMA32 per-cpu: empty
> > Normal per-cpu: empty
> > HighMem per-cpu: empty
> > Free pages:         768kB (0kB HighMem)
> > Active:1650 inactive:2036 dirty:0 writeback:0
> > unstable:0 free:192
> > slab:60106 mapped:764 pagetables:29
> > DMA free:768kB min:2048kB low:2560kB high:3072kB
> > active:6600kB
> > inactive:8144kB present:262144kB pages_scanned:0
> > all_unreclaimab
> > le? no
> > lowmem_reserve[]: 0 0 0 0
> > DMA32 free:0kB min:0kB low:0kB high:0kB active:0kB
> > inactive:0kB
> > present:0kB pages_scanned:0 all_unreclaimable? no
> > lowmem_reserve[]: 0 0 0 0
> > Normal free:0kB min:0kB low:0kB high:0kB
> active:0kB
> > inactive:0kB
> > present:0kB pages_scanned:0 all_unreclaimable? no
> > lowmem_reserve[]: 0 0 0 0
> > HighMem free:0kB min:128kB low:128kB high:128kB
> > active:0kB
> > inactive:0kB present:0kB pages_scanned:0
> > all_unreclaimable? no
> > lowmem_reserve[]: 0 0 0 0
> > DMA: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB
> 1*256kB
> > 1*512kB 0*1024kB
> > 0*2048kB 0*4096kB = 768kB
> > DMA32: empty
> > Normal: empty
> > HighMem: empty
> > Swap cache: add 0, delete 0, find 0/0, race 0+0
> > Free swap  = 0kB
> > Total swap = 0kB
> > Free swap:            0kB
> > 65536 pages of RAM
> > 0 pages of HIGHMEM
> > 662 free pages
> > 1180 reserved pages
> > 1249 pages shared
> > 0 pages swap cached
> > printk: 2159030 messages suppressed.
> >
> >
> >
> > 		
> >
>
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> 
> 



		
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