30 lines
1.0 KiB
Diff
30 lines
1.0 KiB
Diff
From 4dee2794b8c78ccd540e3f72bc07585828e0143b Mon Sep 17 00:00:00 2001
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From: Yang Yanchao <yangyanchao6@huawei.com>
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Date: Thu, 2 Dec 2021 19:56:20 +0800
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Subject: [PATCH] turn the default value of x86_rep_stosb_threshold from 2k to 1M
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x86_rep_stosb_threshold is designed to choose vec mov or stosb.
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For the libMicro, after set this x86_rep_stosb_threshold to 1 MB.
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The performance of memset_256_u, memset_4k_uc, and memset_1m is improved.
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The performance deteriorates in the memset_4k and memset_10k scenarios.
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---
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sysdeps/x86/dl-tunables.list | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/sysdeps/x86/dl-tunables.list b/sysdeps/x86/dl-tunables.list
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index dd6e1d65..a4c3af69 100644
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--- a/sysdeps/x86/dl-tunables.list
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+++ b/sysdeps/x86/dl-tunables.list
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@@ -54,7 +54,7 @@ glibc {
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# stored value is fixed, larger register size has minimal impact
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# on threshold.
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minval: 1
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- default: 2048
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+ default: 1048576
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}
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x86_data_cache_size {
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type: SIZE_T
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--
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2.30.0
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