what is nobarrier ? On 12/31/07, Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx> wrote: > Dave's original e-mail: > > > # mkfs.xfs -f -l lazy-count=1,version=2,size=128m -i attr=2 -d agcount=4 <dev> > > # mount -o logbsize=256k <dev> <mtpt> > > > And if you don't care about filsystem corruption on power loss: > > > # mount -o logbsize=256k,nobarrier <dev> <mtpt> > > > Those mkfs values (except for log size) will be hte defaults in the next > > release of xfsprogs. > > > Cheers, > > > Dave. > > -- > > Dave Chinner > > Principal Engineer > > SGI Australian Software Group > > --------- > > I used his mkfs.xfs options verbatim but I use my own mount options: > noatime,nodiratime,logbufs=8,logbsize=26214 > > Here are the results, the results of 3 bonnie++ averaged together for each > test: > http://home.comcast.net/~jpiszcz/xfs1/result.html > > Thanks Dave, this looks nice--the more optimizations the better! > > ----------- > > I also find it rather pecuilar that in some of my (other) benchmarks my > RAID 5 is just as fast as RAID 0 for extracting large files (uncompressed) > files: > > RAID 5 (1024k CHUNK) > 26.95user 6.72system 0:37.89elapsed 88%CPU (0avgtext+0avgdata > 0maxresident)k0inputs+0outputs (6major+526minor)pagefaults 0swaps > > Compare with RAID 0 for the same operation: > > (as with RAID5, it appears 256k-1024k..2048k possibly) is the sweet spot. > > Why does mdadm still use 64k for the default chunk size? > > And another quick question, would there be any benefit to use (if it were > possible) a block size of > 4096 bytes with XFS (I assume only > IA64/similar arch can support it), e.g. x86_64 cannot because the > page_size is 4096. > > [ 8265.407137] XFS: only pagesize (4096) or less will currently work. > > The speeds: > > extract speed with 4 chunk: > 27.30user 10.51system 0:55.87elapsed 67%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+526minor)pagefaults 0swaps > 27.39user 10.38system 0:56.98elapsed 66%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+528minor)pagefaults 0swaps > 27.31user 10.56system 0:57.70elapsed 65%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+528minor)pagefaults 0swaps > extract speed with 8 chunk: > 27.09user 9.27system 0:54.60elapsed 66%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+525minor)pagefaults 0swaps > 27.23user 8.91system 0:54.38elapsed 66%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+527minor)pagefaults 0swaps > 27.19user 8.98system 0:54.68elapsed 66%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+526minor)pagefaults 0swaps > extract speed with 16 chunk: > 27.12user 7.24system 0:51.12elapsed 67%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+526minor)pagefaults 0swaps > 27.13user 7.12system 0:50.58elapsed 67%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+528minor)pagefaults 0swaps > 27.11user 7.18system 0:50.56elapsed 67%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+527minor)pagefaults 0swaps > extract speed with 32 chunk: > 27.15user 6.52system 0:48.06elapsed 70%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+527minor)pagefaults 0swaps > 27.24user 6.38system 0:49.10elapsed 68%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+528minor)pagefaults 0swaps > 27.11user 6.46system 0:47.56elapsed 70%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+528minor)pagefaults 0swaps > extract speed with 64 chunk: > 27.15user 5.94system 0:45.13elapsed 73%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+525minor)pagefaults 0swaps > 27.17user 5.94system 0:44.82elapsed 73%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+527minor)pagefaults 0swaps > 27.02user 6.12system 0:44.61elapsed 74%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+525minor)pagefaults 0swaps > extract speed with 128 chunk: > 26.98user 5.78system 0:40.48elapsed 80%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+525minor)pagefaults 0swaps > 27.05user 5.73system 0:40.30elapsed 81%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+528minor)pagefaults 0swaps > 27.11user 5.68system 0:40.59elapsed 80%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+526minor)pagefaults 0swaps > extract speed with 256 chunk: > 27.10user 5.60system 0:36.47elapsed 89%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+525minor)pagefaults 0swaps > 27.03user 5.67system 0:36.18elapsed 90%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+528minor)pagefaults 0swaps > 27.17user 5.50system 0:37.38elapsed 87%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+526minor)pagefaults 0swaps > extract speed with 512 chunk: > 27.06user 5.54system 0:36.58elapsed 89%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+524minor)pagefaults 0swaps > 27.03user 5.59system 0:36.31elapsed 89%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+525minor)pagefaults 0swaps > 27.06user 5.58system 0:36.42elapsed 89%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+528minor)pagefaults 0swaps > extract speed with 1024 chunk: > 26.92user 5.69system 0:36.51elapsed 89%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+525minor)pagefaults 0swaps > 27.18user 5.43system 0:36.39elapsed 89%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+528minor)pagefaults 0swaps > 27.04user 5.60system 0:36.27elapsed 90%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+526minor)pagefaults 0swaps > extract speed with 2048 chunk: > 26.97user 5.63system 0:36.99elapsed 88%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+525minor)pagefaults 0swaps > 26.98user 5.62system 0:36.90elapsed 88%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+527minor)pagefaults 0swaps > 27.15user 5.44system 0:37.06elapsed 87%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+526minor)pagefaults 0swaps > extract speed with 4096 chunk: > 27.11user 5.54system 0:38.96elapsed 83%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+526minor)pagefaults 0swaps > 27.09user 5.55system 0:38.85elapsed 84%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+527minor)pagefaults 0swaps > 27.12user 5.52system 0:38.80elapsed 84%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+528minor)pagefaults 0swaps > extract speed with 8192 chunk: > 27.04user 5.57system 0:43.54elapsed 74%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+526minor)pagefaults 0swaps > 27.15user 5.49system 0:43.52elapsed 75%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+526minor)pagefaults 0swaps > 27.11user 5.52system 0:43.66elapsed 74%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+528minor)pagefaults 0swaps > extract speed with 16384 chunk: > 27.25user 5.45system 0:52.18elapsed 62%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+526minor)pagefaults 0swaps > 27.18user 5.52system 0:52.54elapsed 62%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+527minor)pagefaults 0swaps > 27.17user 5.50system 0:51.38elapsed 63%CPU (0avgtext+0avgdata 0maxresident)k > 0inputs+0outputs (6major+525minor)pagefaults 0swaps > > Justin. > - > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- Raz - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
