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Date: Wed, 28 Apr 2010 16:34:03 +0200
From: Eric Dumazet <eric.dumazet@...il.com>
To: hadi@...erus.ca
Cc: David Miller <davem@...emloft.net>, xiaosuo@...il.com,
therbert@...gle.com, shemminger@...tta.com, netdev@...r.kernel.org,
Eilon Greenstein <eilong@...adcom.com>,
Brian Bloniarz <bmb@...enacr.com>
Subject: Re: [PATCH net-next-2.6] net: speedup udp receive path
Le mercredi 28 avril 2010 à 16:19 +0200, Eric Dumazet a écrit :
> I forgot to say that with my previous DDOS test/bench (16 cpus trying to
> feed one udp socket), my receiver can now process 420.000 pps instead of
> 200.000 ;)
And perf top of the cpu dedicated to the thread doing the recvmsg() is :
(after patch)
----------------------------------------------------------------------------------------------------------------------------------------------
PerfTop: 1001 irqs/sec kernel:98.0% [1000Hz cycles], (all, cpu: 1)
----------------------------------------------------------------------------------------------------------------------------------------------
samples pcnt function DSO
_______ _____ _____________________________ ____________________________
5463.00 45.5% _raw_spin_lock_bh vmlinux
761.00 6.3% copy_user_generic_string vmlinux
662.00 5.5% sock_recv_ts_and_drops vmlinux
645.00 5.4% kfree vmlinux
568.00 4.7% _raw_spin_lock vmlinux
494.00 4.1% __skb_recv_datagram vmlinux
488.00 4.1% skb_copy_datagram_iovec vmlinux
467.00 3.9% __slab_free vmlinux
176.00 1.5% udp_recvmsg vmlinux
168.00 1.4% ia32_sysenter_target vmlinux
161.00 1.3% kmem_cache_free vmlinux
161.00 1.3% _raw_spin_lock_irqsave vmlinux
151.00 1.3% memcpy_toiovec vmlinux
131.00 1.1% fget_light vmlinux
130.00 1.1% sock_rfree vmlinux
104.00 0.9% inet_recvmsg vmlinux
99.00 0.8% dst_release vmlinux
98.00 0.8% skb_release_head_state vmlinux
83.00 0.7% __sk_mem_reclaim vmlinux
75.00 0.6% sys_recvfrom vmlinux
61.00 0.5% sysexit_from_sys_call vmlinux
59.00 0.5% fput vmlinux
56.00 0.5% schedule vmlinux
56.00 0.5% sock_recvmsg vmlinux
54.00 0.4% move_addr_to_user vmlinux
51.00 0.4% compat_sys_socketcall vmlinux
48.00 0.4% _raw_spin_unlock_bh vmlinux
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