From: Stephen Hemminger <stephen@networkplumber.org>
To: "Xie, Huawei" <huawei.xie@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [RFC PATCH 2/2] lib/librte_eal: Remove unnecessary hugepage zero-filling
Date: Wed, 18 Nov 2015 08:00:13 -0800 [thread overview]
Message-ID: <20151118080013.3cad8f5b@samsung9> (raw)
In-Reply-To: <C37D651A908B024F974696C65296B57B4B198CF8@SHSMSX101.ccr.corp.intel.com>
On Wed, 18 Nov 2015 12:07:54 +0000
"Xie, Huawei" <huawei.xie@intel.com> wrote:
> >>> The kernel fills new allocated (huge) pages with zeros.
> >>> DPDK just has to touch the pages to trigger the allocation.
> I think we shouldn't reply on the assumption that kernel has zeroed the
> memory. Kernel zeroes the memory mostly to avoid information leakage.It
> could also achieve this by setting each bit to 1.
> What we indeed need to check is later DPDK initialization code doesn't
> assume the memory has been zeroed. Otherwise zero only that part of the
> memory. Does this makes sense?
If all new pages are zero, why does DPDK have to pre-touch the pages
at all?
I thought there as some optimization to initialize hugepages since
Oracle has same problem with their Shared Global Area which was why
hugpages were invented anyway
next prev parent reply other threads:[~2015-11-18 16:00 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-18 3:27 [dpdk-dev] [RFC PATCH 0/2] Reduce DPDK initialization time Zhihong Wang
2015-11-18 3:27 ` [dpdk-dev] [RFC PATCH 1/2] lib/librte_eal: Reduce timer " Zhihong Wang
2015-11-18 3:27 ` [dpdk-dev] [RFC PATCH 2/2] lib/librte_eal: Remove unnecessary hugepage zero-filling Zhihong Wang
2015-11-18 10:39 ` Mcnamara, John
2015-11-18 10:44 ` Wang, Zhihong
2015-11-18 12:07 ` Xie, Huawei
2015-11-18 16:00 ` Stephen Hemminger [this message]
2015-11-18 16:13 ` Richardson, Bruce
2015-11-18 19:09 ` Stephen Hemminger
2015-11-19 2:15 ` Wang, Zhihong
2015-11-19 6:04 ` Xie, Huawei
2015-11-19 6:32 ` Wang, Zhihong
2015-11-19 9:18 ` Sergio Gonzalez Monroy
2015-11-23 2:54 ` Xie, Huawei
2015-11-23 10:18 ` Bruce Richardson
2015-11-20 12:15 ` Bruce Richardson
2015-11-19 3:54 ` Wang, Zhihong
2015-11-19 6:09 ` Xie, Huawei
2015-11-19 9:14 ` Sergio Gonzalez Monroy
2015-11-23 3:46 ` Xie, Huawei
2015-11-23 4:07 ` Stephen Hemminger
2015-11-23 5:05 ` Xie, Huawei
2015-11-23 6:52 ` Stephen Hemminger
2015-11-25 18:24 ` Xie, Huawei
2015-12-24 8:34 ` [dpdk-dev] [RFC PATCH 0/2] Reduce DPDK initialization time Qiu, Michael
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