FreeBSD Bugzilla – Attachment 155167 Details for
Bug 199151
speed up pagezero assembly on Xeon
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[patch]
diff to sys/amd64/amd64/support.S - pagezero function
0001-Unroll-the-loop-for-zeroing-pages-to-be-a-full-cache.patch (text/plain), 872 bytes, created by
Kurt Lidl
on 2015-04-03 19:55:38 UTC
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Description:
diff to sys/amd64/amd64/support.S - pagezero function
Filename:
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Creator:
Kurt Lidl
Created:
2015-04-03 19:55:38 UTC
Size:
872 bytes
patch
obsolete
>From 069c6b026d72a164c5534e8844293d6048132198 Mon Sep 17 00:00:00 2001 >From: Kurt Lidl <lidl@pix.net> >Date: Tue, 3 Mar 2015 00:22:49 -0500 >Subject: [PATCH 1/1] Unroll the loop for zeroing pages to be a full cache line > >Gives a consistant 1% decrease in system time when running "buildworld" >or "buildkernel". >--- > sys/amd64/amd64/support.S | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > >diff --git a/sys/amd64/amd64/support.S b/sys/amd64/amd64/support.S >index f8b75ff..04aea18 100644 >--- a/sys/amd64/amd64/support.S >+++ b/sys/amd64/amd64/support.S >@@ -73,7 +73,11 @@ ENTRY(pagezero) > movnti %rax,8(%rdi,%rdx) > movnti %rax,16(%rdi,%rdx) > movnti %rax,24(%rdi,%rdx) >- addq $32,%rdx >+ movnti %rax,32(%rdi,%rdx) >+ movnti %rax,40(%rdi,%rdx) >+ movnti %rax,48(%rdi,%rdx) >+ movnti %rax,56(%rdi,%rdx) >+ addq $64,%rdx > jne 1b > sfence > POP_FRAME_POINTER >-- >2.3.4 >
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