Date: Sun, 4 Oct 1998 11:37:22 +1000 From: Bruce Evans <bde@zeta.org.au> To: bde@zeta.org.au, tlambert@primenet.com Cc: Don.Lewis@tsc.tdk.com, freebsd-fs@FreeBSD.ORG, freebsd-scsi@FreeBSD.ORG, gibbs@plutotech.com Subject: Re: filesystem safety and SCSI disk write caching Message-ID: <199810040137.LAA14507@godzilla.zeta.org.au>
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>> I think it can be interpreted as showing that the performance hit is >> very large. `make world' is mostly cpu-bound, and most of it's i/o's >> are reads (60% here). I guess it spends less than 5 minutes of its time >> writing (27000 block output operations here). An increase of 5 minutes >> is very large. > >This is without "noatime". Actually, 27000 is with "noatime" on all file systems, and with "async" on all file systems that were written to by my `make world' (/tmp, /var/tmp, MAKEOBJDIRPREFIX = /c/obj and DESTDIR = /c/root). >Every inode read, is written, and every >directory inode is written multiple times, and all object files and >executables, as well as some generated sources, are written. Yes, the default configuration may be much slower than mine. Bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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