From: "Burakov, Anatoly" <anatoly.burakov@intel.com>
To: dev@dpdk.org, Thomas Monjalon <thomas@monjalon.net>
Subject: Re: [dpdk-dev] [PATCH 9/9] memalloc: allocate memory in reverse
Date: Tue, 24 Jul 2018 11:10:11 +0100 [thread overview]
Message-ID: <1f5ef2a7-739e-b90f-8b04-a2a0abe234fa@intel.com> (raw)
In-Reply-To: <914a5f584be81d6c129b35bc8e358774854d8960.1528749451.git.anatoly.burakov@intel.com>
On 11-Jun-18 9:55 PM, Anatoly Burakov wrote:
> Currently, all hugepages are allocated from lower VA address to
> higher VA address, while malloc heap allocates from higher VA
> address to lower VA address. This results in heap fragmentation
> over time due to multiple reserves leaving small space below the
> allocated elements.
>
> Fix this by allocating VA memory from the top, thereby reducing
> fragmentation and lowering overall memory usage.
>
> Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
> ---
> lib/librte_eal/linuxapp/eal/eal_memalloc.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/lib/librte_eal/linuxapp/eal/eal_memalloc.c b/lib/librte_eal/linuxapp/eal/eal_memalloc.c
> index 8c11f98c9..d35fb52c4 100644
> --- a/lib/librte_eal/linuxapp/eal/eal_memalloc.c
> +++ b/lib/librte_eal/linuxapp/eal/eal_memalloc.c
> @@ -682,7 +682,8 @@ alloc_seg_walk(const struct rte_memseg_list *msl, void *arg)
> need = wa->n_segs;
>
> /* try finding space in memseg list */
> - cur_idx = rte_fbarray_find_next_n_free(&cur_msl->memseg_arr, 0, need);
> + cur_idx = rte_fbarray_find_prev_n_free(&cur_msl->memseg_arr,
> + cur_msl->memseg_arr.len - 1, need);
> if (cur_idx < 0)
> return 0;
> start_idx = cur_idx;
>
Hi Thomas,
We have discovered a few regressions in virtio/vhost use cases due to
this patch. Virtio expects to map all segments starting from 0 address,
and this patch breaks that assumption.
Can we revert this for 18.08? It will be reintroduced in 18.11 along
with fixes for virtio/vhost fixes to account for this change.
--
Thanks,
Anatoly
next prev parent reply other threads:[~2018-07-24 10:12 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-11 20:55 [dpdk-dev] [PATCH 0/9] mem: reduce memory fragmentation Anatoly Burakov
2018-06-11 20:55 ` [dpdk-dev] [PATCH 1/9] fbarray: fix errno values returned from functions Anatoly Burakov
2018-06-11 20:55 ` [dpdk-dev] [PATCH 2/9] fbarray: reduce duplication in find_contig code Anatoly Burakov
2018-06-11 20:55 ` [dpdk-dev] [PATCH 3/9] fbarray: reduce duplication in find_next_n code Anatoly Burakov
2018-06-11 20:55 ` [dpdk-dev] [PATCH 4/9] fbarray: reduce duplication in find_next code Anatoly Burakov
2018-06-11 20:55 ` [dpdk-dev] [PATCH 5/9] fbarray: add reverse find_free/used Anatoly Burakov
2018-06-11 20:55 ` [dpdk-dev] [PATCH 6/9] fbarray: add reverse find n used/free Anatoly Burakov
2018-06-11 20:55 ` [dpdk-dev] [PATCH 7/9] fbarray: add reverse find contig used/free Anatoly Burakov
2018-06-11 20:55 ` [dpdk-dev] [PATCH 8/9] test: add fbarray autotests Anatoly Burakov
2018-06-11 20:55 ` [dpdk-dev] [PATCH 9/9] memalloc: allocate memory in reverse Anatoly Burakov
2018-07-24 10:10 ` Burakov, Anatoly [this message]
2018-07-24 10:24 ` Thomas Monjalon
2018-07-13 9:06 ` [dpdk-dev] [PATCH 0/9] mem: reduce memory fragmentation Thomas Monjalon
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