Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263697AbUACSyj (ORCPT ); Sat, 3 Jan 2004 13:54:39 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263742AbUACSyj (ORCPT ); Sat, 3 Jan 2004 13:54:39 -0500 Received: from mail.mediaways.net ([193.189.224.113]:29760 "HELO mail.mediaways.net") by vger.kernel.org with SMTP id S263697AbUACSyE (ORCPT ); Sat, 3 Jan 2004 13:54:04 -0500 Subject: xterm scrolling speed - scheduling weirdness in 2.6 ?! From: Soeren Sonnenburg To: Linux Kernel Content-Type: multipart/mixed; boundary="=-r1EJH17FbMRP2raUydKs" Message-Id: <1073075108.9851.16.camel@localhost> Mime-Version: 1.0 Date: Sat, 03 Jan 2004 19:52:36 +0100 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 10948 Lines: 188 --=-r1EJH17FbMRP2raUydKs Content-Type: text/plain Content-Transfer-Encoding: 7bit Hi... I notice a severe speed regression with 2.6 and working in e.g. xterm on X11 (no framebuffer device in use). It is all about scrolling speed. I used to type e.g. just dmesg in a fullscreen xterm (or MGT) in 2.4 and the whole output was there lightning fast, i.e. in 2.4: ======= time dmesg real 0m0.096s user 0m0.007s sys 0m0.005s in 2.6 (first run) ====== time dmesg [...] real 0m3.054s user 0m0.008s sys 0m0.008s in 2.6 (second run) =================== dmesg >d time cat d real 0m0.096s user 0m0.002s sys 0m0.005s in 2.6 (third run) ================== time dmesg real 0m0.095s user 0m0.007s sys 0m0.004s So it is like 30 times slower on 2.6. when running for the first time... this also happens if I do e.g. find ./ and watch the output pass by... This is without preemption on powerpc... Anyone else with that problem - ideas of the cause ? 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