Date: Wed, 21 Aug 2013 20:47:05 +0200 From: Andre Oppermann <andre@freebsd.org> To: Kevin Oberman <rkoberman@gmail.com> Cc: Lawrence Stewart <lstewart@freebsd.org>, FreeBSD Net <net@freebsd.org> Subject: Re: TSO and FreeBSD vs Linux Message-ID: <52150B29.1090805@freebsd.org> In-Reply-To: <CAN6yY1u01WkywPM5J62cBOpqL6Gc5x9yYPhhXv0aAceYhFYCgQ@mail.gmail.com> References: <520A6D07.5080106@freebsd.org> <520AFBE8.1090109@freebsd.org> <520B24A0.4000706@freebsd.org> <520B3056.1000804@freebsd.org> <520BDEAE.9000104@freebsd.org> <CAN6yY1u01WkywPM5J62cBOpqL6Gc5x9yYPhhXv0aAceYhFYCgQ@mail.gmail.com>
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On 15.08.2013 01:27, Kevin Oberman wrote: > On Wed, Aug 14, 2013 at 12:46 PM, Julian Elischer <julian@freebsd.org>wrote: > >> On 8/14/13 3:23 PM, Lawrence Stewart wrote: >> >>> On 08/14/13 16:33, Julian Elischer wrote: >>> >>> They switched to using an initial window of 10 segments some time ago. >>>>> FreeBSD starts with 3 or more recently, 10 if you're running recent >>>>> 9-STABLE or 10-CURRENT. >>>>> >>>> I tried setting initial values as shown: >>>> net.inet.tcp.local_slowstart_**flightsize: 10 >>>> net.inet.tcp.slowstart_**flightsize: 10 >>>> it didn't seem to make too much difference but I will redo the test. >>>> >>> Assuming this is still FreeBSD 8.0 as you mentioned out-of-band, >>> changing those variables without disabling rfc3390 will have no effect. >>> >>> I think (check the driver code in question as I'm not sure) that if you >>> "ifconfig <if> lro" and the driver has hardware support or has been made >>> aware of our software implementation, it should DTRT. >>> >> >> so I ran on 9.2-beta ( a week or two old) and it had similar problems.. >> only worse.. 9.2 actually sends multiple packets when is doesn't need to.. >> http://people.freebsd.org/~julian/fbsd9.png >> > > Ack! (Sorry) I could have sworn that this had been fixed. Has it been > re-broken? There may be some window update dynamics going on together with LRO received ACK compression. -- Andre
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