Date: Mon, 6 May 2002 14:29:31 +0200 (CEST) From: Martin Nilsson <martin@gneto.com> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/37788: em driver and jumboframes gives instant reboot Message-ID: <20020506122931.5B3795591@platon.gneto.com>
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>Number: 37788 >Category: kern >Synopsis: em driver and jumboframes gives instant reboot >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Mon May 06 05:30:01 PDT 2002 >Closed-Date: >Last-Modified: >Originator: Martin Nilsson >Release: FreeBSD 4.6-PRERELEASE i386 >Organization: >Environment: System: FreeBSD platon.gneto.com 4.6-PRERELEASE FreeBSD 4.6-PRERELEASE #2: Sun May 5 10:44:53 CEST 2002 root@platon.gneto.com:/raid/FreeBSD/obj-RELENG4/raid/FreeBSD/RELENG_4/sys/PLATON i386 >Description: Enable mtu larger than 1500 on an em GigEthernet card and the machine reboots when receiving the first jumbo frame >How-To-Repeat: connect two boxen with intel PRO/1000 XT (82544-based) cards and use the em driver set mtu to 9011. Use an NFS mount and do something after a (short) while one of the machines will reboot. Set mtu to 1500 and it works! Using win2000 on one end and Samba on the other doesn't trigger the bug as SMB either works over TCP or sends smaller packets. >Fix: Don't use jumbo frames for now. >Release-Note: >Audit-Trail: >Unformatted: To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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