On 3/23/06, Jindrich Makovicka <[EMAIL PROTECTED]> wrote: > Hans Reiser wrote: > > Instead of using sync, could you increase the size of the files you > > write so that they are 10x ram size? > > > > I have a suspicion we are slow at sync.... I am not sure why, but I > > have seen other data where sync was slow for us, and maybe we need to > > optimize that code path. > > My impression is rather that the bottleneck is the amount of seeking the > sync causes - would it be possible to reorder the write operations > somehow, still preserving atomicity?
yeah, the kernel is not good at ordering flush during sync, it would work much better if Reiser4 could just be told to do a full sync, and then have only one thread that climbs through the fake inode and squallocs everything. > Also, a comparison of Reiser4 performance on NCQ vs. non-NCQ drive could > be interesting (I don't have NCQ, maybe that's the problem). the scheduler could make a difference too, most likely in the area of 'congestion' threshold and handling. NATE
