linux-kernel - Re: [take13 1/3] kevent: Core files.

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Date:	Fri, 25 Aug 2006 10:32:38 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Andrew Morton <akpm@...l.org>
Cc:	Christoph Hellwig <hch@...radead.org>,
	lkml <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Ulrich Drepper <drepper@...hat.com>,
	netdev <netdev@...r.kernel.org>,
	Zach Brown <zach.brown@...cle.com>
Subject: Re: [take13 1/3] kevent: Core files.

On Thu, Aug 24, 2006 at 11:20:24PM -0700, Andrew Morton (akpm@...l.org) wrote:
> On Fri, 25 Aug 2006 09:48:15 +0400
> Evgeniy Polyakov <johnpol@....mipt.ru> wrote:
> 
> > kmalloc is really slow actually - it always shows somewhere on top 
> > in profiles and brings noticeble overhead
> 
> It shouldn't.  Please describe the workload and send the profiles.

epoll based trivial server (accept + sendfile for the same file, about
4k), httperf with big amount of simulateneous connections. 3c59x NIC 
(with e1000 there were no ioreads and netif_rx).
__alloc_skb calls kmem_cache_alloc() and ___kmalloc().

16158     1.3681  ioread16
8073      0.6835  ioread32
3485      0.2951  irq_entries_start
3018      0.2555  _spin_lock
2103      0.1781  tcp_v4_rcv
1503      0.1273  sysenter_past_esp
1492      0.1263  netif_rx
1459      0.1235  skb_copy_bits
1422      0.1204  _spin_lock_irqsave
1145      0.0969  ip_route_input
983       0.0832  kmem_cache_free
964       0.0816  __alloc_skb
926       0.0784  common_interrupt
891       0.0754  __do_IRQ
846       0.0716  _read_lock
826       0.0699  __netif_rx_schedule
806       0.0682  __kmalloc
767       0.0649  do_tcp_sendpages
747       0.0632  __copy_to_user_ll
744       0.0630  pskb_expand_head


-- 
	Evgeniy Polyakov
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