From: Evgeniy Polyakov Subject: Re: [take13 1/3] kevent: Core files. Date: Fri, 25 Aug 2006 10:32:38 +0400 Message-ID: <20060825063238.GD16504@2ka.mipt.ru> References: <11563322941645@2ka.mipt.ru> <11563322971212@2ka.mipt.ru> <20060824200322.GA19533@infradead.org> <20060825054815.GC16504@2ka.mipt.ru> <20060824232024.0d230823.akpm@osdl.org> Mime-Version: 1.0 Content-Type: text/plain; charset=koi8-r Cc: Christoph Hellwig , lkml , David Miller , Ulrich Drepper , netdev , Zach Brown Return-path: Received: from relay.2ka.mipt.ru ([194.85.82.65]:988 "EHLO 2ka.mipt.ru") by vger.kernel.org with ESMTP id S964870AbWHYGdx (ORCPT ); Fri, 25 Aug 2006 02:33:53 -0400 To: Andrew Morton Content-Disposition: inline In-Reply-To: <20060824232024.0d230823.akpm@osdl.org> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org 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 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