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Date:      Mon, 27 Oct 1997 00:03:13 +1100
From:      Bruce Evans <bde@zeta.org.au>
To:        anton@urc.ac.ru, stable@FreeBSD.ORG
Subject:   Re: Kernel's nfs dramatically slows down a diskless workstation
Message-ID:  <199710261303.AAA21503@godzilla.zeta.org.au>

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>When I compile and install a new kernel for one, it becomes very-very slow.
>Systat -vmstat shows that amount of interrupts take up to 78% of time, and up
>to 700 interrupts per second are produced by ed0 installed on IRQ10.
>...
>pretty enough. Because of nfs.h and nfs_vnopts.h differ in only function
>prototypes and calls, possibly the critical changes are located in nfs_bio.c.

This seems to be fixed in rev.1.42 of nfs_bio.c in -current (ld does a
lot of small writes), and perhaps the i/o size of MAXBSIZE in 2.2.5 is
too big.

Bruce



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