From: Ben Greear <greearb@candelatech.com>
To: Rick Jones <rick.jones2@hp.com>
Cc: NetDev <netdev@vger.kernel.org>
Subject: Re: ixgbe patch to provide NIC's tx/rx counters via ethtool
Date: Wed, 23 Sep 2009 19:08:12 -0700 [thread overview]
Message-ID: <4ABAD48C.9010808@candelatech.com> (raw)
In-Reply-To: <4ABAB727.2020507@hp.com>
Rick Jones wrote:
> Ben Greear wrote:
>> When LRO is enabled, the received packet and byte counters represent the
>> LRO'd packets, not the packets/bytes on the wire.
>
> When LRO is enabled, are all the bytes on the wire actually
> transferred into the host?
No...the ethernet, IP and TCP headers and such are not, for packets that
are combined into a single
large SKB.
That is why the driver counts them wrong. The bytes are off by a few
percentage points, but the
packet count is off by an order of magnitude.
Thanks,
Ben
--
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc http://www.candelatech.com
next prev parent reply other threads:[~2009-09-24 2:08 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-23 22:36 ixgbe patch to provide NIC's tx/rx counters via ethtool Ben Greear
2009-09-24 0:02 ` Rick Jones
2009-09-24 2:08 ` Ben Greear [this message]
2009-09-24 16:30 ` Rick Jones
2009-09-24 17:07 ` Ben Greear
2009-09-24 18:28 ` Peter P Waskiewicz Jr
2009-09-24 19:10 ` Jeff Kirsher
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