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From: "Wiles, Keith" <keith.wiles@intel.com>
To: "dev@dpdk.org" <dev@dpdk.org>
Subject: [dpdk-dev] [RFC] ABI breakage for rte_mempool to reduce footprint
Date: Thu, 28 Jan 2016 19:02:37 +0000	[thread overview]
Message-ID: <8992D4A4-9536-43E4-9655-65821FE5E9E5@intel.com> (raw)


Hi Everyone,

Currently every mempool created has a footprint of 1.5Megs of memory just for the struct rte_mempool, this also includes all of the rte_pktmbuf creates as well. The issue is the local_cache adds about 1.5Megs of memory, which is a huge amount IMHO for non-cached based mempools. Without the local_cache the structure is about 192bytes. You can set the config option for the cache to ’n’, but then all allocations will not use the per core cache. I have some code I will send as a patch to have the local_cache allocated only when a mempool is created and the caller has a non-zero cache size set in the call.

This will break ABI for the struct rte_mempool, but does remove some of the ifdefs for RTE_MEMPOOL_CACHE_SIZE in the code. The performance appears to be the same, but will do some more testing before I submit the patch.

Please let me know if this would be reasonable or other comments.

Regards,
Keith


             reply	other threads:[~2016-01-28 19:02 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-28 19:02 Wiles, Keith [this message]
2016-01-28 20:07 [dpdk-dev] [RFC] Abi " Wiles, Keith

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