Date: Mon, 29 Jun 2015 09:19:58 +0200 From: Gerrit =?ISO-8859-1?Q?K=FChn?= <gerrit.kuehn@aei.mpg.de> To: Rick Macklem <rmacklem@uoguelph.ca> Cc: Scott Larson <stl@wiredrive.com>, freebsd-net@freebsd.org, carsten aulbert <carsten.aulbert@aei.mpg.de> Subject: Re: NFS on 10G interface terribly slow Message-ID: <20150629091958.af9720d478a8903ab28adc1d@aei.mpg.de> In-Reply-To: <1629011632.413406.1435365728977.JavaMail.zimbra@uoguelph.ca> References: <20150625145238.12cf9da3b368ef0b9a30f193@aei.mpg.de> <CAFt8naF7xmZW8bgVrhrL=CaPXiVURqDLsNN5-NHDg=hiv-Qmtw@mail.gmail.com> <1629011632.413406.1435365728977.JavaMail.zimbra@uoguelph.ca>
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On Fri, 26 Jun 2015 20:42:08 -0400 (EDT) Rick Macklem
<rmacklem@uoguelph.ca> wrote about Re: NFS on 10G interface terribly slow:
RM> Btw, can you tell us what Intel chip(s) you're using?
I have
ix0@pci0:5:0:0: class=0x020000 card=0x00028086 chip=0x15288086 rev=0x01
hdr=0x00 vendor = 'Intel Corporation'
device = 'Ethernet Controller 10-Gigabit X540-AT2'
class = network
subclass = ethernet
RM> For example, from the "ix" driver:
RM> #define IXGBE_82598_SCATTER 100
RM> #define IXGBE_82599_SCATTER 32
Hm, I cannot find out into which chipset number this translates for my
device...
RM> Btw, it appears that the driver in head/current now sets
RM> if_hw_tsomaxsegcount, but the driver in stable/10 does not. This means
RM> that the 82599 chip will end up doing the m_defrag() calls for 10.x.
So the next step could even be updating to -current...
OTOH, I get the same (bad) resulsts, no matter if TSO is enabled or
disabled on the interface.
cu
Gerrit
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