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Re: [Xen-devel][Pv-ops][PATCH 0/4 v2] Netback multiple threads support

To: "Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx>
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Mon, 3 May 2010 12:02:28 -0400
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Steven Smith <steven.smith@xxxxxxxxxx>
Delivery-date: Mon, 03 May 2010 09:04:36 -0700
List-id: Xen developer discussion <xen-devel.lists.xensource.com>

> when we test this patch, we found that the domain_lock in grant table
> operation (gnttab_copy()) becomes a bottle neck. We temporarily
> remove the global domain_lock to achieve good performance.

Without that change (global domain_lock in place), what are the
performance numbers?

Is there a forthcoming patch to make the gnttab_copy have a much finer
grained lock?

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