On Mon, Aug 12, 2013 at 05:19:54PM +0000, tudorb at gmail dot com wrote: > --- Comment #28 from Tudor Bosman <tudorb at gmail dot com> --- > FYI, this bug has bitten me in a different way: memcpy() copying backwards > defeats the MADV_SEQUENTIAL flag to madvise(). A trivial file copier > implementation (mmap source, mmap destination, set MADV_SEQUENTIAL, memcpy > from > source to destination) would perform much worse on machines that support SSSE3 > than on machines that don't because of this bug. > Wait, do you have overlapping source and destination areas? If so then a backward copy is necessary.
Or is backward copy called for not overlapping areas? I have a patch that could call backward copy only if src-n < dest < src+n holds. > (Before anyone tells me that I should copy files using read() and write(), my > actual usage pattern was more complex, but the details are irrelevant.) > > -- > You are receiving this mail because: > You are on the CC list for the bug. -- You received this bug notification because you are a member of Canonical Partner Developers, which is subscribed to adobe-flashplugin in Ubuntu. https://bugs.launchpad.net/bugs/727064 Title: [Natty] Strange beeping sound when viewing flash video To manage notifications about this bug go to: https://bugs.launchpad.net/glibc/+bug/727064/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~canonical-partner-dev Post to : canonical-partner-dev@lists.launchpad.net Unsubscribe : https://launchpad.net/~canonical-partner-dev More help : https://help.launchpad.net/ListHelp
