On 9/22/2011 5:08 AM, Anders Magnusson wrote: > What I meant here is that the gateway is a Centos 5 machine running > Samba and OpenAFS 1.4.10 and store data in AFS. So, writing to the > same place in AFS via this machine is significantly faster than using > the IFS client. This is just to show that the performance problem isn't > there if using the Linux client.
If the behavior you are seeing is not a regression from the OpenAFS Windows 1.6.0 client on your systems, then the performance limitation is simply a design limitation of the current Windows cache manager implementation. The cache manager currently requires that all StoreData operations be serialized which limits the number of simultaneous StoreData RPCs on a file to 1. Small chunksizes will result in poor performance. I use ChunkSize 23 (decimal) which equates to 8MB per RPC.
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