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Re: NetBSD 5.1 TCP performance issue (lots of ACK)

On Thu, Oct 27, 2011 at 11:57:00AM -0400, Thor Lancelot Simon wrote:
> On Thu, Oct 27, 2011 at 04:02:12PM +0200, Manuel Bouyer wrote:
> > 
> > ttcp is at 108KB/s (so it's also faster without tso4). Looks like there's
> > definitively a problem with TSO on our side.
> The sending network adapter is a 'wm'?  There are a few models of wm
> with broken TSO support, but as far as I know most work fine.  In
> particular, most 82573 variants you'll actually encounter in the field
> are bad.

Mine is:
wm0 at pci4 dev 0 function 0: i80003 dual 1000baseT Ethernet, rev. 1
wm0: interrupting at ioapic0 pin 18
wm0: PCI-Express bus
wm0: 65536 word (16 address bits) SPI EEPROM
wm0: Ethernet address 00:30:48:32:13:10
ikphy0 at wm0 phy 1: i82563 10/100/1000 media interface, rev. 2

And, except a few strange thing in the pcap file on the sender side,
it seems to work fine (I'm also doing ssh, including some large file
transfers over this interface with tso enabled).

Manuel Bouyer <>
     NetBSD: 26 ans d'experience feront toujours la difference

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