On Thu, Sep 03 2009, Theodore Tso wrote: > On Thu, Sep 03, 2009 at 12:42:09PM -0400, Christoph Hellwig wrote: > > > Careful: > > > > > > - tloff = min(tlast, startpage->index + 64); > > > + tloff = min(tlast, startpage->index + 8192); > > > > > > That will cause 64k page machines to try to write back 512MB at a > > > time. This will re-introduce similar to the behaviour in sles9 where > > > writeback would only terminate at the end of an extent (because the > > > mapping end wasn't capped like above). > > > > Pretty good point, any applies to all the different things we discussed > > recently. Ted, should be maybe introduce a max_writeback_mb instead of > > the max_writeback_pages in the VM, too? > > Good point. > > Jens, maybe we should replace my patch with this one, which makes the > tunable in terms of megabytes instead of pages? That is probably a better metric than 'pages', lets update it. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
