From: "Michael S. Tsirkin" <mst@redhat.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>,
"jdike@c2.user-mode-linux.org" <jdike@c2.user-mode-linux.org>,
"yzhao81@gmail.com" <yzhao81@gmail.com>
Subject: Re: [PATCH 1/3] A device for zero-copy based on KVM virtio-net.
Date: Tue, 6 Apr 2010 10:49:02 +0300 [thread overview]
Message-ID: <20100406074901.GB9662@redhat.com> (raw)
In-Reply-To: <97F6D3BD476C464182C1B7BABF0B0AF5C17B5BB9@shzsmsx502.ccr.corp.intel.com>
On Tue, Apr 06, 2010 at 01:41:37PM +0800, Xin, Xiaohui wrote:
> 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
Yes, that's the default, but system administrator can always increase
this value with ulimit if necessary.
--
MST
next prev parent reply other threads:[~2010-04-06 7:49 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1267868318-19268-1-git-send-email-xiaohui.xin@intel.com>
2010-03-07 10:50 ` [PATCH v1 0/3] Provide a zero-copy method on KVM virtio-net Michael S. Tsirkin
2010-03-09 7:47 ` Xin, Xiaohui
[not found] ` <1267868318-19268-2-git-send-email-xiaohui.xin@intel.com>
[not found] ` <1267868318-19268-3-git-send-email-xiaohui.xin@intel.com>
2010-03-07 11:18 ` [PATCH v1 2/3] Provides multiple submits and asynchronous notifications Michael S. Tsirkin
2010-03-15 8:46 ` Xin, Xiaohui
2010-03-15 9:23 ` Michael S. Tsirkin
2010-03-16 9:32 ` Xin Xiaohui
2010-03-16 11:33 ` [PATCH " Michael S. Tsirkin
2010-03-17 9:48 ` Xin, Xiaohui
2010-03-17 10:27 ` Michael S. Tsirkin
2010-04-01 9:14 ` Xin Xiaohui
2010-04-01 11:02 ` [PATCH " Michael S. Tsirkin
2010-04-02 2:16 ` Xin, Xiaohui
2010-04-04 11:40 ` Michael S. Tsirkin
2010-04-06 5:46 ` Xin, Xiaohui
2010-04-06 7:51 ` Michael S. Tsirkin
2010-04-07 1:36 ` Xin, Xiaohui
2010-04-07 8:18 ` Michael S. Tsirkin
2010-04-08 9:07 ` xiaohui.xin
[not found] ` <1267868318-19268-4-git-send-email-xiaohui.xin@intel.com>
2010-03-06 17:18 ` [PATCH v1 3/3] Let host NIC driver to DMA to guest user space Stephen Hemminger
2010-03-08 11:18 ` Michael S. Tsirkin
2010-03-08 11:28 ` [PATCH v1 1/3] A device for zero-copy based on KVM virtio-net Michael S. Tsirkin
2010-04-01 9:27 ` Xin Xiaohui
2010-04-01 11:08 ` [PATCH " Michael S. Tsirkin
2010-04-06 5:41 ` Xin, Xiaohui
2010-04-06 7:49 ` Michael S. Tsirkin [this message]
2010-04-07 2:41 ` Xin, Xiaohui
2010-04-07 8:15 ` Michael S. Tsirkin
2010-04-07 9:00 ` xiaohui.xin
2010-04-07 11:17 ` [PATCH " Michael S. Tsirkin
2010-02-10 11:48 [PATCH 0/3] Provide a zero-copy method " Xin Xiaohui
2010-02-10 11:48 ` [PATCH 1/3] A device for zero-copy based " Xin Xiaohui
2010-02-10 15:17 ` Eric Dumazet
2010-02-11 5:33 ` Xin, Xiaohui
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