Tom Talpey wrote: > On 6/5/2009 7:35 AM, Steve Dickson wrote: >> Brian R Cowan wrote: >>> Trond Myklebust<trond.myklebust@xxxxxxxxxx> wrote on 06/04/2009 >>> 02:04:58 >>> PM: >>> >>>> Did you try turning off write gathering on the server (i.e. add the >>>> 'no_wdelay' export option)? As I said earlier, that forces a delay of >>>> 10ms per RPC call, which might explain the FILE_SYNC slowness. >>> Just tried it, this seems to be a very useful workaround as well. The >>> FILE_SYNC write calls come back in about the same amount of time as the >>> write+commit pairs... Speeds up building regardless of the network >>> filesystem (ClearCase MVFS or straight NFS). >> >> Does anybody had the history as to why 'no_wdelay' is an >> export default? > > Because "wdelay" is a complete crock? > > Adding 10ms to every write RPC only helps if there's a steady > single-file stream arriving at the server. In most other workloads > it only slows things down. > > The better solution is to continue tuning the clients to issue > writes in a more sequential and less all-or-nothing fashion. > There are plenty of other less crock-ful things to do in the > server, too. Ok... So do you think removing it as a default would cause any regressions? steved. -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
