Messages in this thread | | | Date | Tue, 20 May 2008 10:16:23 +0800 | From | "Dave Young" <> | Subject | Re: ext4-mm-delalloc-ext4-lock-reverse-fix |
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On Tue, May 20, 2008 at 4:37 AM, Alexey Dobriyan <adobriyan@gmail.com> wrote: > On Mon, May 19, 2008 at 05:24:47PM +0200, Jiri Slaby wrote: >> Andrew Morton <akpm@linux-foundation.org> wrote: >> > On Mon, 19 May 2008 15:15:09 +0800 "Dave Young" <hidave.darkstar@gmail.com> wrote: >> > >> > > With 2.6.26-rc2-mm1 I need to sync frequently. It's not normal as my >> > > understanding. >> > > >> > > 1. scp a big file from a lan server. Firstly the speed is about 8M/s, >> > > but the speed will slow down to 100K/s at last. After I exec "sync", >> > > the speed will restore. >> > > >> > > Is this a known issue? >> > > >> > >> > Yes, probably related to the "mkfs takes forever" problem. I haven't >> > looked into it yet. Nor has anyone else afaik. >> >> Absolutely not sure what this breaks in ext4, but fixes the problem for me:
Jiri, it fixes my scp-slow-down problem as well. Thanks.
> > This helps, thank you! > >> --- a/mm/page-writeback.c >> +++ b/mm/page-writeback.c >> @@ -881,7 +881,7 @@ int write_cache_pages(struct address_space *mapping, >> pagevec_init(&pvec, 0); >> if (wbc->range_cyclic) { >> index = mapping->writeback_index; /* Start from prev offset */ >> - end = wbc->range_end >> PAGE_CACHE_SHIFT; >> + end = -1; >> } else { >> index = wbc->range_start >> PAGE_CACHE_SHIFT; >> end = wbc->range_end >> PAGE_CACHE_SHIFT; > >
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