On Sun, Oct 18, 2009 at 9:17 AM, Peter Teoh <htmldeveloper@xxxxxxxxx> wrote: > On 10/18/09, Rik van Riel <riel@xxxxxxxxxxxx> wrote: >> Peter Teoh wrote: >> >> > now the pdflush is deprecated by per-bdi writeout. Can I know >> > conceptually, in a few sentences, what are the key features that >> > enable per-bdi writeout to be faster than pdflush? >> > >> >> Yes. LWN has a great article on the per-bdi writeout changes. >> > > yes, thank you Rik, I saw this: > > http://lwn.net/Articles/326552/ > > since one of the key features is optimization for per-spindle > flushing, now I wonder what are the performance enhancement will be > for SSDs, as they do have spindle? > > Thansk again for the pointer!!! Hi Rik, Peter, Thanks for sharing! Peter, I think spindle is used just as another word for slow device which I guess could be any other type of slow storage medium like iSCSI or loop over NFS. But I have a question with the per-bdi writeout, how does it solve the problem of request starvation, Wont the writeback threads be starved anyway if users kept writing to the device? Thanks, -Joel -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
