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Date: Tue, 6 Apr 2010 13:41:37 +0800 From: "Xin, Xiaohui" <xiaohui.xin@...el.com> To: "Michael S. Tsirkin" <mst@...hat.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>, "jdike@...user-mode-linux.org" <jdike@...user-mode-linux.org>, "yzhao81@...il.com" <yzhao81@...il.com> Subject: RE: [PATCH 1/3] A device for zero-copy based on KVM virtio-net. Michael, >> >>For the DOS issue, I'm not sure how much the limit get_user_pages() >> can pin is reasonable, should we compute the bindwidth to make it? >There's a ulimit for locked memory. Can we use this, decreasing >the value for rlimit array? We can do this when backend is >enabled and re-increment when backend is disabled. I have tried it with rlim[RLIMIT_MEMLOCK].rlim_cur, but I found the initial value for it is 0x10000, after right shift PAGE_SHIFT, it's only 16 pages we can lock then, it seems too small, since the guest virito-net driver may submit a lot requests one time. Thanks Xiaohui -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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