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From: Stephen Hemminger <stephen@networkplumber.org>
To: Yipeng Wang <yipeng1.wang@intel.com>,
	Sameh Gobriel <sameh.gobriel@intel.com>,
	Bruce Richardson <bruce.richardson@intel.com>
Cc: dev@dpdk.org, honnappa.nagarahalli@arm.com,
	pablo.de.lara.guarch@intel.com
Subject: Re: [dpdk-dev] [PATCH] hash: document breakage with multi-writer thread
Date: Fri, 5 Jun 2020 11:35:08 -0700
Message-ID: <20200605113508.746ba6b2@hermes.lan> (raw)
In-Reply-To: <20200604171731.6738-1-stephen@networkplumber.org>

On Thu,  4 Jun 2020 10:17:31 -0700
Stephen Hemminger <stephen@networkplumber.org> wrote:

> The code in rte_cuckoo_hash multi-writer support is broken if write
> operations are called from a non-EAL thread.
> 
> rte_lcore_id() wil return LCORE_ID_ANY (UINT32_MAX) for non EAL
> thread and that leads to using wrong local cache.
> 
> Add error checks and document the restriction.
> 
> Fixes: 9d033dac7d7c ("hash: support no free on delete")
> Fixes: 5915699153d7 ("hash: fix scaling by reducing contention")
> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> Cc: honnappa.nagarahalli@arm.com
> Cc: pablo.de.lara.guarch@intel.com

This restriction also needs to be added to the known issues
section of EAL

  parent reply	other threads:[~2020-06-05 18:35 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-04 17:17 Stephen Hemminger
2020-06-04 17:51 ` Honnappa Nagarahalli
2020-06-04 17:58   ` Stephen Hemminger
2020-06-04 18:43     ` Honnappa Nagarahalli
2020-06-04 19:10       ` Wang, Yipeng1
2020-06-04 19:34         ` Honnappa Nagarahalli
2020-06-04 20:22           ` Wang, Yipeng1
2020-06-04 21:06             ` Stephen Hemminger
2020-06-04 21:32 ` Wang, Yipeng1
2020-06-05 18:35 ` Stephen Hemminger [this message]
2020-06-16 16:12   ` Thomas Monjalon
2020-11-26 17:56     ` Thomas Monjalon

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