freebsd-arm Digest, Vol 207, Issue 2
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Today's Topics:
1. Re: Performance of SheevaPlug on 8-stable (Mark Tinguely)
2. If you have a hardwood floor, times have changed. (Mike Hammond)
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Message: 1
Date: Mon, 15 Mar 2010 12:50:55 -0500 (CDT)
From: Mark Tinguely <ting...@casselton.net>
Subject: Re: Performance of SheevaPlug on 8-stable
To: freeb...@freebsd.org, maksv...@geocities.com
Message-ID: <201003151750....@casselton.net>
On Fri, 12 Mar 2010 18:51, Maks Verver said:
> On 03/10/2010 04:53 PM, Rafal Jaworowski wrote:
> > Mark, Can you confirm this worsening over time happens with a fresh
> > (from scratch) kernel build (with Mark T. patch applied)? Please
> > provide the scenario / steps which lead to this behaviour.
>
> Was this directed at me? If so, I've rebuilt the distribution from
> CURRENT sources (previously, I used 8-STABLE with some patches applied)
> which I believe includes Mark Tinguely's patches.
>
> With these patches, the problem doesn't occur for tests that I run
> immediately after booting. However, if I create a new binary (either by
> recompiling, which is what I did before, or simply by copying, as I
> found out) then this new binary executes slowly:
>
> elysium# time ./test
> 9.000u 0.000s 0:09.07 99.6% 40+1324k 1+0io 0pf+0w
> elysium# cp test test2
> elysium# time ./test2
> 287.000u 0.000s 4:48.54 99.5% 40+1322k 0+0io 0pf+0w
>
> 9 seconds is still slower than it should be (Linux runs this test
> program in 5.4 s) but this may well be a completely separate issue.
>
> I also added the KASSERT line that Mark Tinguely suggested, but I forgot
> to enable the INVARIANT option when rebuilding the kernel. I'll have to
> get back to you on that one.
>
> Kind regards,
> Maks Verver.
As a FYI to everyone else, I ask Maks to include a printf statement
in vm_hold_free_pages(); it ensures the vm_page and the KVA are in sync
on the pages that are freed. I also added a printf statement in the
pmap_remove_pages() and pmap_remove_all() routines to make sure they
are not being called before freeing the page.
pmap_remove_pages() is for a memory map being removed. Kernel maps
are global, so we can't go and clear them.
pmap_remove_all() removes all references to a particular page. We
cannot remove the pte entry in pmap_remove_all(), but we might be able
to remove the md.pv_kva value. It seems to me that that kernel allocator
should still call the pmap_[kq]remove() for this page.
Worse case, we can clean the md.pv_kva and md.pv_flags when we free the
page. We might get some objections from the VM people about this.
--Mark Tinguely.
------------------------------
Message: 2
Date: Mon, 15 Mar 2010 12:48:42 -0500 (CDT)
From: "Mike Hammond" <sa...@floorguardian.com>
Subject: If you have a hardwood floor, times have changed.
To: freeb...@freebsd.org
Message-ID:
<1268675322_SectionID-501087_HitID-1268672224...@ss36.on9mail.com>
Content-Type: text/plain; charset=utf-8
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End of freebsd-arm Digest, Vol 207, Issue 2
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