From: Stephen Hemminger <shemminger@vyatta.com>
To: "Xin, Xiaohui" <xiaohui.xin@intel.com>
Cc: "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"mingo@elte.hu" <mingo@elte.hu>,
"mst@redhat.com" <mst@redhat.com>,
"jdike@c2.user-mode-linux.org" <jdike@c2.user-mode-linux.org>,
"davem@davemloft.net" <davem@davemloft.net>
Subject: Re: [RFC] [PATCH v2 3/3] Let host NIC driver to DMA to guest user space.
Date: Thu, 8 Apr 2010 17:52:25 -0700 [thread overview]
Message-ID: <20100408175225.7577af19@nehalam> (raw)
In-Reply-To: <97F6D3BD476C464182C1B7BABF0B0AF5C17B5C2A@shzsmsx502.ccr.corp.intel.com>
On Tue, 6 Apr 2010 14:26:29 +0800
"Xin, Xiaohui" <xiaohui.xin@intel.com> wrote:
> >How do you deal with the DoS problem of hostile user space app posting huge
> >number of receives and never getting anything.
>
> That's a problem we are trying to deal with. It's critical for long term.
> Currently, we tried to limit the pages it can pin, but not sure how much is reasonable.
> For now, the buffers submitted is from guest virtio-net driver, so it's safe in some extent
> just for now.
It is critical even now. Once you get past toy benchmarks you will see things like
Java processes with 1000 threads all reading at once.
prev parent reply other threads:[~2010-04-09 0:52 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-02 7:30 [RFC] [PATCH v2 3/3] Let host NIC driver to DMA to guest user space xiaohui.xin
2010-04-02 15:55 ` Stephen Hemminger
2010-04-06 6:26 ` Xin, Xiaohui
2010-04-09 0:52 ` Stephen Hemminger [this message]
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