Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932088AbWJREph (ORCPT ); Wed, 18 Oct 2006 00:45:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932087AbWJREph (ORCPT ); Wed, 18 Oct 2006 00:45:37 -0400 Received: from sp604002mt.neufgp.fr ([84.96.92.61]:50609 "EHLO sMtp.neuf.fr") by vger.kernel.org with ESMTP id S932078AbWJREpg (ORCPT ); Wed, 18 Oct 2006 00:45:36 -0400 Date: Wed, 18 Oct 2006 06:45:35 +0200 From: Eric Dumazet Subject: Re: [take19 1/4] kevent: Core files. In-reply-to: <20061018041014.GA14588@2ka.mipt.ru> To: Evgeniy Polyakov Cc: Johann Borck , Ulrich Drepper , Ulrich Drepper , lkml , David Miller , Andrew Morton , netdev , Zach Brown , Christoph Hellwig , Chase Venters Message-id: <4535B16F.7080208@cosmosbay.com> MIME-version: 1.0 Content-type: text/plain; charset=KOI8-R; format=flowed Content-transfer-encoding: 7BIT References: <11587449471424@2ka.mipt.ru> <200610171826.05028.dada1@cosmosbay.com> <20061017163536.GA17692@2ka.mipt.ru> <200610171845.54719.dada1@cosmosbay.com> <20061018041014.GA14588@2ka.mipt.ru> User-Agent: Thunderbird 1.5.0.7 (Windows/20060909) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1698 Lines: 40 Evgeniy Polyakov a e'crit : > On Tue, Oct 17, 2006 at 06:45:54PM +0200, Eric Dumazet (dada1@cosmosbay.com) wrote: >> I am not sure I understand what you wrote, English is not our native language. >> >> I think many people gave you feedbacks. I feel that all feedback on this >> mailing list is constructive. Many posts/patches on this list are never >> commented at all. > > And I do greatly appreciate feedback from those people! > > But I do not understand why I never got feedback on initial design and > implementation (and then created as far as I recall at least 10 > releases) from Ulrich, who first asked for such a feture. > So right now I'm waiting for his opinion on that problem, even if it will > be 'it sucks' again, but at least in that case I will not waste people's time. > > Ulrich, could you please comment on design notes sent couple of mail > above? Ulrich is a very busy man. We have to live with that. For example, I *complained* one day, that each glibc fopen()/fread()/fclose() pass does a mmap()/munmap() to obtain a single 4KB of memory, without any cache mechanism. This badly hurts performance of multi-threaded programs as we know mmap()/munmap() has to down_write(&mm->mmap_sem); and play VM games. So to avoid this, I manually call setvbuf() in my own programs, to provide a suitable buffer to glibc, because of its suboptimal default allocation, vestige of an old epoch... Eric - 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/