[dpdk-stable] [dpdk-dev] [PATCH v2 2/4] hash: add local cache for TSX region
Bruce Richardson
bruce.richardson at intel.com
Tue Nov 13 18:48:48 CET 2018
On Tue, Nov 13, 2018 at 05:24:55PM +0000, Wang, Yipeng1 wrote:
> >-----Original Message-----
> >From: Honnappa Nagarahalli [mailto:Honnappa.Nagarahalli at arm.com]
> >Sent: Tuesday, November 13, 2018 9:17 AM
> >To: Thomas Monjalon <thomas at monjalon.net>; Richardson, Bruce <bruce.richardson at intel.com>; Wang, Yipeng1
> ><yipeng1.wang at intel.com>
> >Cc: stable at dpdk.org; dev at dpdk.org; nd <nd at arm.com>; nd <nd at arm.com>
> >Subject: RE: [dpdk-stable] [dpdk-dev] [PATCH v2 2/4] hash: add local cache for TSX region
> >> > > /* Check extra flags field to check extra options. */
> >> > > - if (params->extra_flag &
> >> > > RTE_HASH_EXTRA_FLAGS_TRANS_MEM_SUPPORT)
> >> > > + if (params->extra_flag &
> >> > > RTE_HASH_EXTRA_FLAGS_TRANS_MEM_SUPPORT) {
> >> > > + use_local_cache = 1;
> >> > Do you see the issue even in the case of single writer? Enabling this flag
> >> creates local caches on all the data plane cores. This increases the memory
> >> usage for the single writer use case. Then there is 'writers on the control
> >> plane' use case, the requirement on hash_add rate is comparatively lower
> >> when compared to 'writers on the data plane'. The writers also are not pinned
> >> to any core as well. In this use case, I am not sure how much having a local
> >> cache matters.
> >> >
> >> > Enabling this flag effectively changes the free slot allocation from a ring to a
> >> stack data structure. Does it indicate that for single writer use case with TSX,
> >> the free slot (global) data structure should be a stack (rather than a ring)?
> >>
> >> Is it blocking this patchset from entering in 18.11?
> >> If I understand well, there are some fixes for 18.11.
>
> [Wang, Yipeng] Hi Thomas, please go ahead merge the other commits without this one since Honnapa's concern.
> I will talk with Honnappa separately on a better way to do this.
>
> Thanks!
No objections to that plan here.
/Bruce
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