Date: Thu, 7 Jun 2001 14:02:15 +0200 (CEST) From: thomas.pornin@ens.fr To: FreeBSD-gnats-submit@freebsd.org Cc: alpha@freebsd.org Subject: alpha/27933: Time jitter under load on FreeBSD 4.3 alpha Message-ID: <200106071202.f57C2F010016@pc-freebsd-s7.ens.fr>
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>Number: 27933 >Category: alpha >Synopsis: Time jitter under load on FreeBSD 4.3 alpha >Confidential: no >Severity: non-critical >Priority: medium >Responsible: freebsd-alpha >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Thu Jun 07 05:10:01 PDT 2001 >Closed-Date: >Last-Modified: >Originator: Thomas Pornin >Release: FreeBSD 4.3-RELEASE alpha >Organization: Ecole Normale Superieure >Environment: The machine is an AXPpci (NoName) board, with a 166 MHz 21066 Alpha cpu, 32 MB of ram, 256 KB of cache. Disks are scsi, using the onboard 53c810 controller; driver is ncr. >Description: Under high load, the clock drifts: it slows down. It looses about 20 minutes during a complete "make buildworld" (which takes about 22 hours on that machine). I installed ntpd; when the machine is idle, everything is fine, but when there is some load (cpu, disk, memory, I do not know which one is relevant), ntpd issues messages such as "time reset -1.319533 s" every 20 minutes or so. (I actually observed that effect with FreeBSD 4.0 to 4.2 on a Multia, which is supposed to be similar to the AXPpci board) >How-To-Repeat: Deactivate ntpd, setup date and clock, perform a make buildworld, type "date" afterwards, observe the date shift. >Fix: None included. I can perform a bit of testing, just ask. >Release-Note: >Audit-Trail: >Unformatted: To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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