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Date: Fri, 13 Jan 2006 21:53:47 -0800
From: Steve Kargl <sgk@troutmask.apl.washington.edu>
To: Kris Kennaway <kris@obsecurity.org>
Message-ID: <20060114055347.GA45580@troutmask.apl.washington.edu>
References: <20060114052117.GA16773@xor.obsecurity.org>
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Cc: current@freebsd.org
Subject: Re: Extreme contigmalloc() slowness with mpt driver
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On Sat, Jan 14, 2006 at 12:21:17AM -0500, Kris Kennaway wrote:
> I have an amd64 machine with 16GB of RAM that takes ages to boot (~40
> minutes on 7.0).  This is because the mpt driver takes 20 minutes to
> attach (with 2 instances).  This in turn is because the following code
> from dev/mpt/mpt_pci.c:mpt_dma_mem_alloc() takes about 5 seconds to
> execute, and it is run 256 times in a loop:
> 
>                 error = bus_dmamap_create(mpt->buffer_dmat, 0, &req->dmap);
> 
> When I set vm.old_contigmalloc=1, the system boots without delay.
> 
> This points to a bug in contigmalloc.
> 

This is probably related to my recent reports of extremely
slow probing of fxp0.  I have 12 GB on a Tyan K8S Pro and
fxp0 takes on the order of 7 minutes to probe.

-- 
Steve