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update to glibc-2.28-251.2.src.rpm

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Signed-off-by: Zhao Hang <wb-zh951434@alibaba-inc.com>
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Zhao Hang 2024-05-29 10:21:30 +08:00
parent e44d0a27bf
commit bd4ad22e2b
160 changed files with 43782 additions and 39677 deletions
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glibc-RHEL-15696-61.patch Normal file
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@ -0,0 +1,56 @@
From cf2c57526ba4b57e6863ad4db8a868e2678adce8 Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Fri, 30 Apr 2021 05:58:59 -0700
Subject: [PATCH] x86: Set rep_movsb_threshold to 2112 on processors with FSRM
Content-type: text/plain; charset=UTF-8
The glibc memcpy benchmark on Intel Core i7-1065G7 (Ice Lake) showed
that REP MOVSB became faster after 2112 bytes:
Vector Move REP MOVSB
length=2112, align1=0, align2=0: 24.20 24.40
length=2112, align1=1, align2=0: 26.07 23.13
length=2112, align1=0, align2=1: 27.18 28.13
length=2112, align1=1, align2=1: 26.23 25.16
length=2176, align1=0, align2=0: 23.18 22.52
length=2176, align1=2, align2=0: 25.45 22.52
length=2176, align1=0, align2=2: 27.14 27.82
length=2176, align1=2, align2=2: 22.73 25.56
length=2240, align1=0, align2=0: 24.62 24.25
length=2240, align1=3, align2=0: 29.77 27.15
length=2240, align1=0, align2=3: 35.55 29.93
length=2240, align1=3, align2=3: 34.49 25.15
length=2304, align1=0, align2=0: 34.75 26.64
length=2304, align1=4, align2=0: 32.09 22.63
length=2304, align1=0, align2=4: 28.43 31.24
Use REP MOVSB for data size > 2112 bytes in memcpy on processors with
fast short REP MOVSB (FSRM).
* sysdeps/x86/dl-cacheinfo.h (dl_init_cacheinfo): Set
rep_movsb_threshold to 2112 on processors with fast short REP
MOVSB (FSRM).
---
sysdeps/x86/cacheinfo.h | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/sysdeps/x86/cacheinfo.h b/sysdeps/x86/cacheinfo.h
index f72f634a..cc3941d3 100644
--- a/sysdeps/x86/cacheinfo.h
+++ b/sysdeps/x86/cacheinfo.h
@@ -430,6 +430,12 @@ init_cacheinfo (void)
rep_movsb_threshold = 2048 * (16 / 16);
minimum_rep_movsb_threshold = 16 * 8;
}
+
+ /* NB: The default REP MOVSB threshold is 2112 on processors with fast
+ short REP MOVSB (FSRM). */
+ if (CPU_FEATURE_USABLE_P (cpu_features, FSRM))
+ rep_movsb_threshold = 2112;
+
if (cpu_features->rep_movsb_threshold > minimum_rep_movsb_threshold)
__x86_rep_movsb_threshold = cpu_features->rep_movsb_threshold;
else
--
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