Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sat, 22 Mar 2003 11:00:22 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 22 Mar 2003 11:00:21 -0500 Received: from zcars04f.nortelnetworks.com ([47.129.242.57]:40874 "EHLO zcars04f.nortelnetworks.com") by vger.kernel.org with ESMTP id ; Sat, 22 Mar 2003 11:00:18 -0500 Message-ID: <3E7C8B22.7020505@nortelnetworks.com> Date: Sat, 22 Mar 2003 11:11:14 -0500 X-Sybari-Space: 00000000 00000000 00000000 From: Chris Friesen User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.8) Gecko/20020204 X-Accept-Language: en-us MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: lmbench results for 2.4 and 2.5 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4098 Lines: 83 My previous testing with unix sockets prompted me to do a few lmbench runs with 2.4.19 and 2.5.65. The results have me a bit concerned, as there is no area where 2.5 is faster and several where it is significantly slower. In particular: stat is 8 times worse open/close are 7 times worse fork is twice as expensive tcp latency is 5 times worse file deletion and mmap are both twice as expensive tcp bandwidth is 5 times worse Optimizing for muliple processors and heavy loads is nice, but this looks like its happening at the cost of basic performance. Is this really the route we should be taking? L M B E N C H 2 . 0 S U M M A R Y ------------------------------------ Processor, Processes - times in microseconds - smaller is better ---------------------------------------------------------------- Host OS Mhz null null open selct sig sig fork exec sh call I/O stat clos TCP inst hndl proc proc proc ------ ------------- ---- ---- ---- ---- ---- ----- ---- ---- ---- ---- ---- doug Linux 2.5.65 750 0.38 0.61 39.8 42.1 1.07 5.29 424. 2378 20.K doug Linux 2.5.65 750 0.38 0.54 40.2 44.2 1.07 5.31 439. 2386 20.K doug Linux 2.4.19 750 0.37 0.52 5.21 6.78 36.7 0.93 3.59 197. 1472 15.K Context switching - times in microseconds - smaller is better ------------------------------------------------------------- Host OS 2p/0K 2p/16K 2p/64K 8p/16K 8p/64K 16p/16K 16p/64K ctxsw ctxsw ctxsw ctxsw ctxsw ctxsw ctxsw --------- ------------- ----- ------ ------ ------ ------ ------- ------- doug Linux 2.5.65 1.790 3.0300 118.7 46.1 158.3 46.5 158.2 doug Linux 2.5.65 1.950 2.9800 122.6 46.3 159.5 47.1 158.7 doug Linux 2.4.19 1.690 2.6700 92.9 44.4 155.2 45.0 155.8 *Local* Communication latencies in microseconds - smaller is better ------------------------------------------------------------------- Host OS 2p/0K Pipe AF UDP RPC/ TCP RPC/ TCP ctxsw UNIX UDP TCP conn --------- ------------- ----- ----- ---- ----- ----- ----- ----- ---- doug Linux 2.5.65 1.790 8.926 16.3 29.7 60.6 171.5 204.6 216. doug Linux 2.5.65 1.950 9.695 18.1 28.6 59.8 173.4 207.0 212. doug Linux 2.4.19 1.690 6.146 12.4 17.8 44.2 26.2 66.6 101. File & VM system latencies in microseconds - smaller is better -------------------------------------------------------------- Host OS 0K File 10K File Mmap Prot Page Create Delete Create Delete Latency Fault Fault --------- ------------- ------ ------ ------ ------ ------- ----- ----- doug Linux 2.5.65 110.2 65.0 242.5 100.7 3130.0 0.621 4.00000 doug Linux 2.5.65 110.1 63.5 237.2 96.6 3284.0 0.741 4.00000 doug Linux 2.4.19 82.5 32.4 187.5 47.9 1660.0 1.177 3.00000 *Local* Communication bandwidths in MB/s - bigger is better ----------------------------------------------------------- Host OS Pipe AF TCP File Mmap Bcopy Bcopy Mem Mem UNIX reread reread (libc) (hand) read write --------- ------------- ---- ---- ---- ------ ------ ------ ------ ---- ----- doug Linux 2.5.65 167. 94.7 14.3 212.5 354.8 214.5 215.9 474. 328.4 doug Linux 2.5.65 175. 86.3 14.2 216.3 354.1 211.4 210.9 474. 328.8 doug Linux 2.4.19 220. 108. 86.4 238.2 369.1 215.5 215.0 496. 328.0 -- Chris Friesen | MailStop: 043/33/F10 Nortel Networks | work: (613) 765-0557 3500 Carling Avenue | fax: (613) 765-2986 Nepean, ON K2H 8E9 Canada | email: cfriesen@nortelnetworks.com - 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/