Date: Wed, 4 Sep 2013 15:25:59 -0700 From: Adrian Chadd <adrian@freebsd.org> To: David Wolfskill <david@catwhisker.org> Cc: FreeBSD Net <net@freebsd.org> Subject: Re: TSO and FreeBSD vs Linux Message-ID: <CAJ-Vmo=Caktd%2B1yPP2yXabDwGkup5WMYYZboUk9sYD1BGujZ9w@mail.gmail.com> In-Reply-To: <20130904222004.GD1577@albert.catwhisker.org> References: <20130903192734.GA19406@albert.catwhisker.org> <979862494.17918795.1378299005617.JavaMail.root@uoguelph.ca> <CAJ-Vmomctb9WFYkt89-WjX=_DzktNgty96ANaOAVzWZfvYXK-Q@mail.gmail.com> <20130904222004.GD1577@albert.catwhisker.org>
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What's netstat -sp tcp show before/after the test? -adrian On 4 September 2013 15:20, David Wolfskill <david@catwhisker.org> wrote: > On Wed, Sep 04, 2013 at 03:03:12PM -0700, Adrian Chadd wrote: > > Hiya, > > > > David - can you put together a minimal test case that others can > reproduce? > > I have a bunch of gige intel NICs that I can try this with when I'm back > in > > the office. > > ... > > On NFS client machine (w/ Intel NICs): > * Ensure that net.inet.tcp.tso=1. > * Create or gain access to a regular file, size > 2^21 bytes. > * In my case, "ifconfig em0" showed both TSO4 & VLAN_HWTSO. I have not > experimented to determine whether either or both of those is required > -- and in my case, the machine is my desktop here at work: I would > prefer to avoid breaking it. :-} > * Mount a writable file system with adequate free space via NFS. > * Write the file (e.g., via cp(1)). > > If that fails to re-create the problem, perhaps you'll need to have > another NIC and run IPFW & natd. Something similar to the stock > "simple" configuration (/etc/rc.firewall) should do. > > During the write, I would run "tcpdump -s 0 -w /tmp/cp.bpf host > $NFS_server", > then look at the captured traffic later. I used wireshark; it pointed > out the retransmissions. > > Peace, > david > -- > David H. Wolfskill david@catwhisker.org > Taliban: Evil cowards with guns afraid of truth from a 14-year old girl. > > See http://www.catwhisker.org/~david/publickey.gpg for my public key. >
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