51 messages in org.freebsd.freebsd-armRe: Performance of SheevaPlug on 8-st...| From | Sent On | Attachments |
|---|---|---|
| Maks Verver | Mar 6, 2010 12:39 pm | |
| Bernd Walter | Mar 6, 2010 1:16 pm | |
| Bernd Walter | Mar 6, 2010 1:51 pm | |
| M. Warner Losh | Mar 6, 2010 2:25 pm | |
| Maks Verver | Mar 6, 2010 5:39 pm | |
| Bernd Walter | Mar 6, 2010 10:59 pm | |
| Maks Verver | Mar 7, 2010 11:55 am | |
| Bernd Walter | Mar 7, 2010 12:11 pm | |
| Rafal Jaworowski | Mar 7, 2010 12:30 pm | |
| Mark Tinguely | Mar 7, 2010 1:25 pm | |
| Maks Verver | Mar 7, 2010 1:38 pm | |
| Bernd Walter | Mar 7, 2010 4:26 pm | |
| Bernd Walter | Mar 7, 2010 5:30 pm | |
| Bernd Walter | Mar 7, 2010 6:16 pm | |
| Mark Tinguely | Mar 7, 2010 6:59 pm | |
| Bernd Walter | Mar 8, 2010 12:20 am | |
| Jacques Fourie | Mar 8, 2010 12:25 am | |
| Hans Petter Selasky | Mar 8, 2010 1:06 am | |
| Bernd Walter | Mar 8, 2010 4:40 am | |
| Mark Tinguely | Mar 8, 2010 5:57 am | |
| M. Warner Losh | Mar 8, 2010 6:07 am | |
| Maks Verver | Mar 8, 2010 6:28 am | |
| Grzegorz Bernacki | Mar 8, 2010 7:50 am | |
| M. Warner Losh | Mar 8, 2010 8:14 am | |
| Mark Tinguely | Mar 8, 2010 10:18 am | |
| Bernd Walter | Mar 8, 2010 10:41 am | |
| Mark Tinguely | Mar 8, 2010 11:36 am | |
| Bernd Walter | Mar 8, 2010 11:54 am | |
| Maks Verver | Mar 8, 2010 3:50 pm | |
| Rafal Jaworowski | Mar 9, 2010 2:03 am | |
| Grzegorz Bernacki | Mar 9, 2010 8:11 am | |
| Mark Tinguely | Mar 9, 2010 10:11 am | |
| Grzegorz Bernacki | Mar 10, 2010 5:57 am | |
| Rafal Jaworowski | Mar 10, 2010 6:04 am | |
| Mark Tinguely | Mar 10, 2010 6:20 am | |
| Bernd Walter | Mar 10, 2010 6:37 am | |
| Rafal Jaworowski | Mar 10, 2010 7:52 am | |
| Mark Tinguely | Mar 10, 2010 8:41 am | |
| Mark Tinguely | Mar 10, 2010 10:06 am | |
| Rafal Jaworowski | Mar 11, 2010 1:18 pm | |
| Maks Verver | Mar 12, 2010 9:51 am | |
| Maks Verver | Mar 12, 2010 11:58 am | |
| Mark Tinguely | Mar 12, 2010 1:20 pm | |
| Mark Tinguely | Mar 15, 2010 10:50 am | |
| Mark Tinguely | Mar 22, 2010 7:54 am | |
| Olivier Houchard | Mar 22, 2010 8:05 am | |
| Mark Tinguely | Mar 22, 2010 9:25 am | |
| Steve Woodford | Mar 23, 2010 1:14 am | |
| Grzegorz Bernacki | Mar 23, 2010 4:13 am | |
| Mark Tinguely | Mar 23, 2010 5:56 am | |
| Mark Tinguely | Nov 3, 2010 9:08 am |
| Subject: | Re: Performance of SheevaPlug on 8-stable | |
|---|---|---|
| From: | Bernd Walter (tic...@cicely7.cicely.de) | |
| Date: | Mar 10, 2010 6:37:48 am | |
| List: | org.freebsd.freebsd-arm | |
On Wed, Mar 10, 2010 at 03:05:14PM +0100, Rafal Jaworowski wrote:
On 2010-03-10, at 14:58, Grzegorz Bernacki wrote:
There are a few data dangling allocations that I would like to see closed from the multiple kernel allocation fix. *IN THEORY, IF* a page is allocated via the arm_nocache (DMA COHERENT) or a sendfile, then it is never marked as unallocated. *IN THEORY*, if that page is used again, then we could falsely believe that page is being shared and we turn off the cache, eventhough it is not shared. http://www.casselton.net/~tinguely/arm_pmap_unmanaged.diff * Disclaimer: I am not sure if DMA COHERENT nor sendfiles are used in the Sheeva implementation. This is a theoritical observation of a side effect of the multiple kernel mapping patch that we did just before FreeBSD 8-release.
I instrumented code with KTRs and your theory is correct. Kernel reuse page which was previouly mapped via arm_nocache. Your patch should be applied to -current.
Bernd,
Could you confirm this also fixes the issues for you on the RM9200 machine? If
so, I'll go on and commit the changes.
For me it helped to get back to the speed of my older systems. Someone mentioned that even with this patch the speed can still drop after some time.
-- B.Walter <ber...@bwct.de> http://www.bwct.de Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.
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