netdev - Re: SO_REUSEPORT - can it be done in kernel?

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Date:	Tue, 1 Mar 2011 09:22:35 -0500
From:	Thomas Graf <tgraf@...radead.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	David Miller <davem@...emloft.net>, rick.jones2@...com,
	therbert@...gle.com, wsommerfeld@...gle.com,
	daniel.baluta@...il.com, netdev@...r.kernel.org
Subject: Re: SO_REUSEPORT - can it be done in kernel?

On Tue, Mar 01, 2011 at 03:06:59PM +0100, Eric Dumazet wrote:
> Would be nice to cpu affine named to _not_ run on CPU11, just to
> specialize it for TX completions and have softirq time percentage and
> "perf top -C 11 " results

----------------------------------------------------------------------------------------------------------------------
   PerfTop:     995 irqs/sec  kernel:97.7%  exact:  0.0% [1000Hz cpu-clock-msecs],  (all, CPU: 11)
----------------------------------------------------------------------------------------------------------------------

             samples  pcnt function                    DSO
             _______ _____ ___________________________ ___________________________________________________________

              335.00 23.3% intel_idle                  /lib/modules/2.6.38-rc5+/build/vmlinux                     
              253.00 17.6% be_tx_compl_process         /lib/modules/2.6.38-rc5+/kernel/drivers/net/benet/be2net.ko
              177.00 12.3% skb_release_data            /lib/modules/2.6.38-rc5+/build/vmlinux                     
              132.00  9.2% kfree                       /lib/modules/2.6.38-rc5+/build/vmlinux                     
              127.00  8.8% kfree_skb                   /lib/modules/2.6.38-rc5+/build/vmlinux                     
              105.00  7.3% be_poll_tx_mcc              /lib/modules/2.6.38-rc5+/kernel/drivers/net/benet/be2net.ko
               99.00  6.9% kmem_cache_free             /lib/modules/2.6.38-rc5+/build/vmlinux                     
               36.00  2.5% __do_softirq                /lib/modules/2.6.38-rc5+/build/vmlinux                     
               20.00  1.4% _raw_spin_unlock_irqrestore /lib/modules/2.6.38-rc5+/build/vmlinux                     
               19.00  1.3% skb_release_head_state      /lib/modules/2.6.38-rc5+/build/vmlinux                     
               13.00  0.9% unmap_tx_frag               /lib/modules/2.6.38-rc5+/kernel/drivers/net/benet/be2net.ko
               11.00  0.8% rb_next                     /usr/bin/perf                                              
               10.00  0.7% dso__find_symbol            /usr/bin/perf                                              
                9.00  0.6% is_swiotlb_buffer           /lib/modules/2.6.38-rc5+/build/vmlinux                     
                9.00  0.6% __strcmp_sse42              /lib64/libc-2.12.so                                        
                8.00  0.6% __kfree_skb                 /lib/modules/2.6.38-rc5+/build/vmlinux                     
                8.00  0.6% __strstr_sse42              /lib64/libc-2.12.so                                        
                6.00  0.4% _int_malloc                 /lib64/libc-2.12.so      
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