From: Stephen Hemminger <shemminger@vyatta.com>
To: Joakim Tjernlund <joakim.tjernlund@transmode.se>
Cc: netdev@vger.kernel.org
Subject: Re: interrupt coalescing and CSUM offload
Date: Fri, 14 Sep 2012 09:32:52 -0700 [thread overview]
Message-ID: <20120914093252.020992cc@nehalam.linuxnetplumber.net> (raw)
In-Reply-To: <OF3E0CDC2E.8FFEBDC0-ONC1257A79.004A2EB6-C1257A79.00502122@transmode.se>
On Fri, 14 Sep 2012 16:35:13 +0200
Joakim Tjernlund <joakim.tjernlund@transmode.se> wrote:
>
> I am adding interrupt coalescing to the ucc_geth driver. Unfortunately
> there is only support for RX interrupt coalescing.
> I wonder if there is any way "simulate" TX interrupt coalescing?
>
> I am also looking at adding HWCSUM support but this device can only do
> IP header CSUM offload. This doesn't seem to be an option in Linux?
> As I understand it, one must do CSUM offload for the whole frame, both
> IP header and TCP/UDP csums?
>
> Jocke
There are a few drivers that turn off TX interrupt completely.
They cleanup TX buffers on next send and have a timer to cleanup
as well. This has performance benefits, but it does cause issues
with local flow control (the freeing of skb is used to rate
limit local traffic).
next prev parent reply other threads:[~2012-09-14 16:33 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-14 14:35 interrupt coalescing and CSUM offload Joakim Tjernlund
2012-09-14 16:32 ` Stephen Hemminger [this message]
2012-09-15 12:09 ` Joakim Tjernlund
2012-09-17 16:18 ` Stephen Hemminger
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