Messages in this thread | | | Date | Thu, 02 Dec 2004 02:00:37 -0500 | From | Jeff Garzik <> | Subject | Re: page fault scalability patch V12 [0/7]: Overview and performance tests |
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Andrew Morton wrote: > We need an -rc3 yet. And I need to do another pass through the > regressions-since-2.6.9 list. We've made pretty good progress there > recently. Mid to late December is looking like the 2.6.10 date.
another for that list, BTW:
I am currently chasing a 2.6.8->2.6.9 SATA regression, which causes ata_piix (Intel ICH5/6/7) to not-find some SATA devices on x86-64 SMP, but works on UP. Potentially related to >=4GB of RAM.
Details, in case anyone is interested: Unless my code is screwed up (certainly possible), PIO data-in [using the insw() call] seems to return all zeroes on a true-blue SMP machine, for the identify-device command. When this happens, libata (correctly) detects a bad id page and bails. (problem doesn't show up on single CPU w/ HT)
What changed from 2.6.8 to 2.6.9 is
2.6.8: bitbang ATA taskfile registers (loads command) bitbang ATA data register (read id page)
2.6.9: bitbang ATA taskfile registers queue_work() workqueue thread bitbangs ATA data register (read id page)
So I wonder if <something> doesn't like CPU 0 sending I/O traffic to the on-board SATA PCI device, then immediately after that, CPU 1 sending I/O traffic.
Anyway, back to debugging... :)
Jeff
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