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Arrange to align shared disk buffers on at least 32-byte boundaries,

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not just MAXALIGN boundaries.  This makes a noticeable difference in
the speed of transfers to and from kernel space, at least on recent
Pentiums, and might help other CPUs too.  We should look at making
this happen for local buffers and buffile.c too.  Patch from Manfred Spraul.
This commit is contained in:
Tom Lane
2003-09-21 17:57:21 +00:00
parent 11b274f00f
commit 5aa29e88e9
3 changed files with 24 additions and 6 deletions
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10
src/include/pg_config_manual.h
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@ -6,7 +6,7 @@
* for developers. If you edit any of these, be sure to do a *full*
* rebuild (and an initdb if noted).
*
* $Id: pg_config_manual.h,v 1.5 2003/08/04 00:43:29 momjian Exp $
* $Id: pg_config_manual.h,v 1.6 2003/09/21 17:57:21 tgl Exp $
*------------------------------------------------------------------------
*/
@ -126,6 +126,14 @@
*/
#define BITS_PER_BYTE 8
/*
* Preferred alignment for disk I/O buffers. On some CPUs, copies between
* user space and kernel space are significantly faster if the user buffer
* is aligned on a larger-than-MAXALIGN boundary. Ideally this should be
* a platform-dependent value, but for now we just hard-wire it.
*/
#define ALIGNOF_BUFFER 32
/*
* Disable UNIX sockets for those operating system.
*/