On Thu, Sep 11, 2008 at 04:55:01PM +0800, Lin Mac wrote: > Hi, > > > > Is there any kernel patch to fix this issue? or any discussion, clues? > > Not that I know of at the moment. I'm waiting for the Linux > > kernel to support splice from socket -> file. Code's all > > there in Samba. > > Does using splice would really do help in performance much? > Since the performance improvement might comes from two advantage: > 1. no going to user space. > 2. no memory copy > splice surely have advantage 1, but doest it have the > second? Can we avoid memory copy with splice, while > writing files to samba? (scatter-gather in block write?)
Just to get things straight: Recently I've seen a Xeon box ship almost 500 megabytes (!) per second to smbclient using a single SMB connection via RAMdisk->smbd->10GigE->smbclient->/dev/null. This was without sendfile. So unless you want to squeeze the last 5% out of a heavily loaded server, I'd say the advantages of sendfile/recvfile are close to negligible. I might be wrong here, but the network latencies together with non-optimally queued requests by the client have a MUCH greater influence. Volker
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