Messages in this thread | | | Subject | re: mmap over nfs leads to excessive system load | From | Trond Myklebust <> | Date | Tue, 08 Nov 2005 12:01:47 -0800 |
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On Tue, 2005-11-08 at 11:25 -0800, Kenny Simpson wrote: > Just another data point.... > If I open the file with O_DIRECT.. not much changes:
Hmm... Are you mounting using the -osync or -onoac options? Doing synchronous writes will tend to slow down flushing considerably, and the VM appears to be very fragile w.r.t. slow filesystems.
Cheers, Trond
> samples % image name app name symbol name > 12585321 18.9373 vmlinux-2.6.14 vmlinux-2.6.14 find_get_pages_tag > 8608887 12.9539 vmlinux-2.6.14 vmlinux-2.6.14 mpage_writepages > 6870600 10.3383 vmlinux-2.6.14 vmlinux-2.6.14 unlock_page > 6605417 9.9393 vmlinux-2.6.14 vmlinux-2.6.14 clear_page_dirty_for_io > 6259207 9.4183 vmlinux-2.6.14 vmlinux-2.6.14 release_pages > 3249493 4.8896 vmlinux-2.6.14 vmlinux-2.6.14 __lookup_tag > 3248871 4.8886 vmlinux-2.6.14 vmlinux-2.6.14 pci_conf1_write > 2677914 4.0295 vmlinux-2.6.14 vmlinux-2.6.14 page_waitqueue > 982811 1.4789 vmlinux-2.6.14 vmlinux-2.6.14 _read_lock_irqsave > 917165 1.3801 vmlinux-2.6.14 vmlinux-2.6.14 _read_unlock_irq > 758960 1.1420 vmlinux-2.6.14 vmlinux-2.6.14 __wake_up_bit > 706607 1.0632 vmlinux-2.6.14 vmlinux-2.6.14 _spin_lock_irqsave > > > -Kenny > > > > > > __________________________________ > Yahoo! Mail - PC Magazine Editors' Choice 2005 > http://mail.yahoo.com > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
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