Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751087AbWHYG7v (ORCPT ); Fri, 25 Aug 2006 02:59:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750775AbWHYG7v (ORCPT ); Fri, 25 Aug 2006 02:59:51 -0400 Received: from smtp.osdl.org ([65.172.181.4]:27047 "EHLO smtp.osdl.org") by vger.kernel.org with ESMTP id S1750771AbWHYG7u (ORCPT ); Fri, 25 Aug 2006 02:59:50 -0400 Date: Thu, 24 Aug 2006 23:58:59 -0700 From: Andrew Morton To: Evgeniy Polyakov Cc: Christoph Hellwig , lkml , David Miller , Ulrich Drepper , netdev , Zach Brown Subject: Re: [take13 1/3] kevent: Core files. Message-Id: <20060824235859.f8840fb2.akpm@osdl.org> In-Reply-To: <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> <20060825063238.GD16504@2ka.mipt.ru> X-Mailer: Sylpheed version 2.2.7 (GTK+ 2.8.17; x86_64-unknown-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1725 Lines: 47 On Fri, 25 Aug 2006 10:32:38 +0400 Evgeniy Polyakov wrote: > 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 > That doesn't look too bad. What's that as a percentage of total user+system time? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/