Date: Mon, 2 Nov 1998 15:28:11 -0800 (PST) From: Michael Smith <msmith@FreeBSD.ORG> To: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: cvs commit: src/sys/boot/alpha/common main.c src/sys/boot/alpha/libalpha srmdisk.c src/sys/boot/common bcache.c Makefile.inc bootstrap.h src/sys/boot/i386/libi386 biosdisk.c src/sys/boot/i386/loader main.c Message-ID: <199811022328.PAA15931@freefall.freebsd.org>
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msmith 1998/11/02 15:28:11 PST
Modified files:
sys/boot/alpha/common main.c
sys/boot/alpha/libalpha srmdisk.c
sys/boot/common Makefile.inc bootstrap.h
sys/boot/i386/libi386 biosdisk.c
sys/boot/i386/loader main.c
Added files:
sys/boot/common bcache.c
Log:
Implement a simple LRU block cache. By default this is initialised to 16k,
and will bypass transfers for more than 8k. Blocks are invalidated after
2 seconds, so removable media should not confuse the cache.
The 8k threshold is a compromise; all UFS transfers performed by
libstand are 8k or less, so large file reads thrash the cache.
However many filesystem metadata operations are also performed using
8k blocks, so using a lower threshold gives poor performance.
Those of you with an eye for cache algorithms are welcome to tell me
how badly this one sucks; you can start with the 'bcachestats' command
which will print the contents of the cache and access statistics.
Revision Changes Path
1.9 +6 -1 src/sys/boot/alpha/common/main.c
1.3 +13 -6 src/sys/boot/alpha/libalpha/srmdisk.c
1.7 +4 -3 src/sys/boot/common/Makefile.inc
1.16 +10 -1 src/sys/boot/common/bootstrap.h
1.17 +12 -1 src/sys/boot/i386/libi386/biosdisk.c
1.14 +6 -1 src/sys/boot/i386/loader/main.c
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