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kern/42608: bge on optiplex 745 and tso

>Number:         42608
>Category:       kern
>Synopsis:       bge on optiplex 745 and tso
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jan 11 16:10:00 +0000 2010
>Originator:     Matthias Pfaller
>Release:        NetBSD 5.99.23
Matthias Pfaller                            Software Entwicklung
marco Systemanalyse und Entwicklung GmbH    Tel   +49 8131 5161-41
Hans-Böckler-Str. 2, D 85221 Dachau         Fax   +49 8131 5161-66                        Email
System: NetBSD joghurt 5.99.23 NetBSD 5.99.23 (JOGHURT) #4: Mon Jan 11 10:22:44 
CET 2010 leo@joghurt:/usr/src/sys/arch/i386/compile/JOGHURT i386
Architecture: i386
Machine: i386
        I just got a Dell Optiplex 745 with:
                bge0 at pci2 dev 0 function 0: Broadcom BCM5754 Gigabit Ethernet
                bge0: interrupting at ioapic0 pin 16
                bge0: ASIC BCM5754/5787 A2 (0xb002), Ethernet address 
                bge0: setting short Tx thresholds
                brgphy0 at bge0 phy 1: BCM5754/5787 1000BASE-T media interface, 
rev. 0
                brgphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 
1000baseT, 1000baseT-FDX, auto
        With tso enabled, tcp transfer speed (using ftp) drops to about
        2.5 KiB/s...
        after a "ifconfig bge0 -tso" I get ~80MiB/s in my environment.

        Use bge0 on a Optiplex 745 and enable tso.
        disable tso with "ifconfig bge0 -tso".


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