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

Evgeniy Polyakov
2006-08-25T06:33:54Z

On Thu, Aug 24, 2006 at 11:20:24PM -0700, Andrew Morton (akpm@osdl.org) wrote:
> On Fri, 25 Aug 2006 09:48:15 +0400
> Evgeniy Polyakov <johnpol@2ka.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