Messages in this thread | | | Date | Wed, 28 Apr 2004 06:29:42 +0100 | From | Christoph Hellwig <> | Subject | Re: 2.6.6-rc{1,2} bad VM/NFS interaction in case of dirty page writeback |
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On Tue, Apr 27, 2004 at 11:36:47AM -0400, Trond Myklebust wrote: > writepage() only deals with one page at a time, so it will work fine for > doing stage 1. > If you also try force it to do stage 2, then you will end up with chunks > of size <= PAGE_CACHE_SIZE because there will only be 1 page on the NFS > private list of dirty pages. In practice this again means that you > usually have to send 8 times as many RPC requests to the server in order > to process the same amount of data.
There's nothing speaking against probing for more dirty pages before and after the one ->writepage wants to write out and send the big request out. XFS does this to avoid creating small extents when converting from delayed allocated space to real extents.
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