linux-kernel - RE: [PATCH 1/3] A device for zero-copy based on KVM virtio-net.

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Message-ID: <97F6D3BD476C464182C1B7BABF0B0AF5C17B5BB9@shzsmsx502.ccr.corp.intel.com>
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

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