From owner-linux@cthulhu.engr.sgi.com Sat Feb 24 02:21:37 1996 Received: from cthulhu.engr.sgi.com by neteng.engr.sgi.com via ESMTP (950413.SGI.8.6.12/940406.SGI.AUTO) for id CAA01353; Sat, 24 Feb 1996 02:21:37 -0800 Return-Path: Received: by cthulhu.engr.sgi.com (950511.SGI.8.6.12.PATCH526/911001.SGI) id CAA19391; Sat, 24 Feb 1996 02:21:36 -0800 Date: Sat, 24 Feb 1996 02:21:36 -0800 Message-Id: <199602241021.CAA19391@cthulhu.engr.sgi.com> To: linux-archive@neteng.engr.sgi.com From: Majordomo@cthulhu.engr.sgi.com Subject: Welcome to linux Reply-To: Majordomo@cthulhu.engr.sgi.com -- Welcome to the linux mailing list! If you ever want to remove yourself from this mailing list, you can send mail to "Majordomo@relay.engr.sgi.com" with the following command in the body of your email message: unsubscribe linux linux-archive@neteng.engr Here's the general information for the list you've subscribed to, in case you don't already have it: [Last updated on: Sat Feb 24 3:32:43 1996] This linux@engr.sgi.com mailing list is for those of us at SGI who believe Linux is a good thing that we shouldn't ignore or even better: do something proactive about it. As a first step we would like to see a port of Linux to the MIPS architecture happen. A mailing list of the interested people may accelerate this process by bringing the right people together. If you no longer wish to receive this list, send the following to linux-request@relay.engr.sgi.com: unsubscribe linux Ariel Faigon (ariel@engr) is the owner of this list. Happy Linuxing. From owner-linux@cthulhu.engr.sgi.com Wed Feb 28 10:16:37 1996 Received: from cthulhu.engr.sgi.com by neteng.engr.sgi.com via ESMTP (950413.SGI.8.6.12/940406.SGI.AUTO) id KAA03923; Wed, 28 Feb 1996 10:16:37 -0800 Return-Path: Received: by cthulhu.engr.sgi.com (950511.SGI.8.6.12.PATCH526/911001.SGI) for linux-list id KAA09495; Wed, 28 Feb 1996 10:16:34 -0800 Received: from neteng.engr.sgi.com by cthulhu.engr.sgi.com via ESMTP (950511.SGI.8.6.12.PATCH526/911001.SGI) for id KAA09486; Wed, 28 Feb 1996 10:16:32 -0800 Received: from localhost by neteng.engr.sgi.com via SMTP (950413.SGI.8.6.12/940406.SGI.AUTO) id KAA03916; Wed, 28 Feb 1996 10:16:30 -0800 Message-Id: <199602281816.KAA03916@neteng.engr.sgi.com> To: linux@neteng.engr.sgi.com, greg@neteng.engr.sgi.com, jmb@neteng.engr.sgi.com, jmw@neteng.engr.sgi.com, nn@neteng.engr.sgi.com, aje@neteng.engr.sgi.com Subject: a chuckle for you Date: Wed, 28 Feb 1996 10:16:30 -0800 From: Larry McVoy Sender: owner-linux@cthulhu.engr.sgi.com Precedence: bulk Linus has a 300Mhz Alpha running linux. He's pissed at me because I didn't ever anticipate any OS being able to do a null system call (write a byte /dev/null) in a really short time. I measure in usecs, he needs nanoseconds. Think about it: he has an entry into the system so fast that he needs to measure it in nanoseconds. I included R10K, Ultrasparc, Alpha, and P6 numbers below Linus' note. --lm But Larry: we really do need more than microsecond accuracy: [torvalds@tiirakari linux]$ ./lat_syscall $Id: lat_syscall.c,v 1.2 1995/09/24 01:32:37 lm Exp $ Null syscall: 1 microseconds We're definitely approaching the limit.. Linus L M B E N C H 1 . 1 S U M M A R Y ------------------------------------ Processor, Processes - times in microseconds - smaller is better ---------------------------------------------------------------- Host OS Mhz Null sig sig fork exec sh call inst hndl Proc Proc Proc --------- ------------- ---- ---- ---- ---- ---- ---- ---- Alpha300 Linux 1.3.70 300 1 8 1 0.4K 1K 6K P6-aurora Linux 1.3.37 200 4 7 3 0.4K 5K 14K ultraspar SunOS 5.5 167 6 59 5 3.7K 20K 37K R10K IRIX64 6.2-no 200 4 15 9 1.8K 8K 13K 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 --------- ------------- ----- ------ ------ ------ ------ ------- ------- Alpha300 Linux 1.3.70 2 14 97 26 150 35 151 P6-aurora Linux 1.3.37 6 12 32 14 325 50 327 ultraspar SunOS 5.5 14 51 30 90 185 96 204 R10K IRIX64 6.2-no 21 24 25 32 48 72 223 *Local* Communication latencies in microseconds - smaller is better ------------------------------------------------------------------- Host OS 2p/0K Pipe UDP RPC/ TCP RPC/ TCP ctxsw UDP TCP conn --------- ------------- ----- ----- ----- ----- ----- ----- ---- Alpha300 Linux 1.3.70 2 12 73 152 97 204 0 P6-aurora Linux 1.3.37 6 26 93 180 216 346 263 ultraspar SunOS 5.5 14 62 197 267 162 346 852 R10K IRIX64 6.2-no 21 74 362 829 197 390 951 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 --------- ------------- ------ ------ ------ ------ ------- ----- ----- Alpha300 Linux 1.3.70 49 4 83 11 10 -1 0.0K P6-aurora Linux 1.3.37 75 4 213 35 36 -1 0.0K ultraspar SunOS 5.5 1818 833 2564 1851 212 -1 2.7K R10K IRIX64 6.2-no 374 389 353 387 55 -1 21.5K *Local* Communication bandwidths in MB/s - bigger is better ----------------------------------------------------------- Host OS Pipe TCP File Mmap Bcopy Bcopy Mem Mem reread reread (libc) (hand) read write --------- ------------- ---- ---- ------ ------ ------ ------ ---- ----- Alpha300 Linux 1.3.70 131 38 108 114 65 66 129 110 P6-aurora Linux 1.3.37 89 18 40 36 56 42 208 56 ultraspar SunOS 5.5 61 51 85 101 167 85 129 152 R10K IRIX64 6.2-no 85 53 75 92 44 59 101 84 Memory latencies in nanoseconds - smaller is better (WARNING - may not be correct, check graphs) --------------------------------------------------- Host OS Mhz L1 $ L2 $ Main mem Guesses --------- ------------- --- ---- ---- -------- ------- Alpha300 Linux 1.3.70 300 0 48 360 P6-aurora Linux 1.3.37 200 10 53 179 ultraspar SunOS 5.5 166 6 42 270 R10K IRIX64 6.2-no 200 5 55 1115 From owner-linux@cthulhu.engr.sgi.com Thu Feb 29 10:26:55 1996 Received: from cthulhu.engr.sgi.com by neteng.engr.sgi.com via ESMTP (950413.SGI.8.6.12/940406.SGI.AUTO) id KAA25174; Thu, 29 Feb 1996 10:26:55 -0800 Return-Path: Received: by cthulhu.engr.sgi.com (950511.SGI.8.6.12.PATCH526/911001.SGI) for linux-list id KAA15611; Thu, 29 Feb 1996 10:26:13 -0800 Received: from neteng.engr.sgi.com by cthulhu.engr.sgi.com via ESMTP (950511.SGI.8.6.12.PATCH526/911001.SGI) for id KAA15600; Thu, 29 Feb 1996 10:26:12 -0800 Received: by neteng.engr.sgi.com (950413.SGI.8.6.12/940406.SGI.AUTO) for linux@engr id KAA25153; Thu, 29 Feb 1996 10:26:11 -0800 Date: Thu, 29 Feb 1996 10:26:11 -0800 From: lm@neteng.engr.sgi.com (Larry McVoy) Message-Id: <199602291826.KAA25153@neteng.engr.sgi.com> To: linux@cthulhu.engr.sgi.com Subject: kernel hacking noise Sender: owner-linux@cthulhu.engr.sgi.com Precedence: bulk Hi- I'm working with a guy at Rutgers that is doing the sparc linux ports. We're trying to get him in here this summer to do a mips linux port. Anyway, we have a lot of discussions going on about kernel performance hacks, etc. To me, and possibly to other OS hackers, they are really interesting (stuff like optimizing system entry costs - he went from 128 usecs to 3 on a sparc classic). I know there is a subset of the people on this list that might be interested in seeing this mail, but I don't know if the whole list wants to see it. The volume is typically 1-10 messages / day. What I want to know is would anyone on this list _not_ like to see this mail? If you don't reply, I'll assume it is OK with you. If you do reply, then I'll create a separate list for the kernel hacking. Thanks, --lm --- Larry McVoy lm@sgi.com http://reality.sgi.com/lm (415) 933-1804 Copyright 1996, all rights reserved. Microsoft Network is prohibited from redistributing this work in any form, in whole or in part without license. License to distribute this work is available to Microsoft at $500. Transmission without permission constitutes an agreement to these terms.