From: David Miller <davem@davemloft.net>
To: zoltan.kiss@citrix.com
Cc: ian.campbell@citrix.com, wei.liu2@citrix.com,
xen-devel@lists.xenproject.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, jonathan.davies@citrix.com
Subject: Re: [PATCH net-next v5 0/9] xen-netback: TX grant mapping with SKBTX_DEV_ZEROCOPY instead of copy
Date: Wed, 22 Jan 2014 17:50:31 -0800 (PST) [thread overview]
Message-ID: <20140122.175031.873909526743971037.davem@davemloft.net> (raw)
In-Reply-To: <1390253069-25507-1-git-send-email-zoltan.kiss@citrix.com>
From: Zoltan Kiss <zoltan.kiss@citrix.com>
Date: Mon, 20 Jan 2014 21:24:20 +0000
> A long known problem of the upstream netback implementation that on the TX
> path (from guest to Dom0) it copies the whole packet from guest memory into
> Dom0. That simply became a bottleneck with 10Gb NICs, and generally it's a
> huge perfomance penalty. The classic kernel version of netback used grant
> mapping, and to get notified when the page can be unmapped, it used page
> destructors. Unfortunately that destructor is not an upstreamable solution.
> Ian Campbell's skb fragment destructor patch series [1] tried to solve this
> problem, however it seems to be very invasive on the network stack's code,
> and therefore haven't progressed very well.
> This patch series use SKBTX_DEV_ZEROCOPY flags to tell the stack it needs to
> know when the skb is freed up.
This series does not apply to net-next due to some other recent changes.
Please respin, thanks.
next prev parent reply other threads:[~2014-01-23 1:50 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-20 21:24 [PATCH net-next v5 0/9] xen-netback: TX grant mapping with SKBTX_DEV_ZEROCOPY instead of copy Zoltan Kiss
2014-01-20 21:24 ` [PATCH net-next v5 1/9] xen-netback: Introduce TX grant map definitions Zoltan Kiss
2014-02-18 17:06 ` Ian Campbell
2014-02-18 20:36 ` Zoltan Kiss
2014-02-19 10:05 ` Ian Campbell
2014-02-19 19:54 ` Zoltan Kiss
2014-02-20 9:33 ` Ian Campbell
2014-02-21 1:19 ` Zoltan Kiss
2014-02-24 11:13 ` Ian Campbell
2014-02-20 10:13 ` Wei Liu
2014-02-18 17:24 ` Ian Campbell
2014-02-19 19:19 ` Zoltan Kiss
2014-01-20 21:24 ` [PATCH net-next v5 2/9] xen-netback: Change TX path from grant copy to mapping Zoltan Kiss
2014-02-18 17:40 ` Ian Campbell
2014-02-18 18:46 ` [Xen-devel] " David Vrabel
2014-02-19 9:54 ` Ian Campbell
2014-02-19 12:27 ` David Vrabel
2014-02-22 22:33 ` Zoltan Kiss
2014-02-24 16:56 ` Zoltan Kiss
2014-01-20 21:24 ` [PATCH net-next v5 3/9] xen-netback: Remove old TX grant copy definitons and fix indentations Zoltan Kiss
2014-01-20 21:24 ` [PATCH net-next v5 4/9] xen-netback: Change RX path for mapped SKB fragments Zoltan Kiss
2014-02-18 17:45 ` Ian Campbell
2014-02-22 23:18 ` Zoltan Kiss
2014-02-24 13:49 ` Zoltan Kiss
2014-02-24 15:08 ` Zoltan Kiss
2014-02-27 12:43 ` Wei Liu
2014-02-27 15:49 ` Zoltan Kiss
2014-02-27 16:01 ` Wei Liu
2014-01-20 21:24 ` [PATCH net-next v5 5/9] xen-netback: Add stat counters for zerocopy Zoltan Kiss
2014-01-20 21:24 ` [PATCH net-next v5 6/9] xen-netback: Handle guests with too many frags Zoltan Kiss
2014-01-20 21:24 ` [PATCH net-next v5 7/9] xen-netback: Add stat counters for frag_list skbs Zoltan Kiss
2014-01-20 21:24 ` [PATCH net-next v5 8/9] xen-netback: Timeout packets in RX path Zoltan Kiss
2014-01-20 22:03 ` Wei Liu
2014-01-20 22:12 ` Wei Liu
2014-01-21 0:24 ` Zoltan Kiss
2014-01-20 21:24 ` [PATCH net-next v5 9/9] xen-netback: Aggregate TX unmap operations Zoltan Kiss
2014-01-23 1:50 ` David Miller [this message]
2014-01-23 13:13 ` [PATCH net-next v5 0/9] xen-netback: TX grant mapping with SKBTX_DEV_ZEROCOPY instead of copy Zoltan Kiss
2014-01-23 21:39 ` David Miller
2014-01-23 21:49 ` Zoltan Kiss
2014-02-19 9:50 ` Ian Campbell
2014-02-24 15:31 ` Zoltan Kiss
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