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Message-ID: <20100408175225.7577af19@nehalam> Date: Thu, 8 Apr 2010 17:52:25 -0700 From: Stephen Hemminger <shemminger@...tta.com> To: "Xin, Xiaohui" <xiaohui.xin@...el.com> Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "mingo@...e.hu" <mingo@...e.hu>, "mst@...hat.com" <mst@...hat.com>, "jdike@...user-mode-linux.org" <jdike@...user-mode-linux.org>, "davem@...emloft.net" <davem@...emloft.net> Subject: Re: [RFC] [PATCH v2 3/3] Let host NIC driver to DMA to guest user space. On Tue, 6 Apr 2010 14:26:29 +0800 "Xin, Xiaohui" <xiaohui.xin@...el.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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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