netdev - Re: GRO aggregation

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Message-ID: <CAJZOPZL8qrqYfAvcQBDB9CFy7WwztWchaMyADGBnwKpW-r1Q4g@mail.gmail.com>
Date:	Thu, 13 Sep 2012 12:59:30 +0300
From:	Or Gerlitz <or.gerlitz@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Shlomo Pongartz <shlomop@...lanox.com>,
	Rick Jones <rick.jones2@...com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: GRO aggregation

On Thu, Sep 13, 2012 at 11:11 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> MAX_SKB_FRAGS is 16
> skb_gro_receive() will return -E2BIG once this limit is hit.
> If you use a MSS = 100 (instead of MSS = 1460), then GRO skb will
> contain only at most 1700 bytes, but TSO packets can still be 64KB, if
> the sender NIC can afford it (some NICS wont work quite well)

Hi Eric,

Addressing this assertion of yours, Shlomo showed that with ixgbe he managed
to see GRO aggregating 32KB which means 20-21 packets that is > 16 fragments
in this notation, can it be related to the way ixgbe is actually
allocating skbs?

Or.
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