EM and TSO

[Steven Hartland]

Even on PCI-e devices this has some nasty side effects i.e. on a PFSence
firewall box based on 7.0-RELEASE-p3 with TSO enabled, access via the
public network to the web interface is almost impossible. Simply disabling
TSO and all was good.

This may not be strictly down to the HW or driver but is another
reason to not enable it by default if it causes such poor performance.

    Regards
    Steve

----- Original Message ----- 
From: "Sam Leffler" <sam at errno.com>
To: "Jack Vogel" <jfvogel at gmail.com>
Cc: "freebsd-net" <freebsd-net at freebsd.org>; "FreeBSD Current" <freebsd-current at freebsd.org>
Sent: Wednesday, May 16, 2007 10:00 PM
Subject: Re: EM and TSO


> Jack Vogel wrote:
>> I introduced a change yesterday that limited TSO to PCI Express
>> adapters, I did this more for avoidance rather than a bug fix, and
>> I'm not 100% sure its the right thing, so I thought I would poll
>> everyone, do you have a PCI-X adapter and are using TSO without
>> problems and wish to keep the support in?
>> 
>> If no one is then I'll just leave it as is.
> 
> It might be better to enable it by default on pci-e adapters and require
> manual enable on other adapters that are capable but may not function
> correctly.
> 
> Sam
> 
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