On Thu, 27 Jan 2011 19:07:19 +0100 Emmanuel Florac <eflorac@xxxxxxxxxxxxxx> wrote: > > Using mount -t cifs //server/share /mnt/share between two big servers > connected with 10GigE, I've got : 115 MB/s reading, 132 MB/s writing. > Using smbclient, I've got 450 MB/s reading, 132 MB/s writing (NFS gives > ~ 260 MB/s write, 550 MB/s read on the same setup, with absolutely zero > optimisation). > > Why this huge difference? BTW, why such a discrepancy between read and > write speed? FWIW, linux-cifs-client@xxxxxxxxxxxxxxx is deprecated. cc'ing linux-cifs@xxxxxxxxxxxxxxx which is the new mailing list... Most likely you're seeing the result of a lack of parallelism in the Linux kernel cifs client. It does not do async writes (yet), which really hinders throughput. I'm hoping to get to work on that in the next few months unless someone else beats me to it... -- Jeff Layton <jlayton@xxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-cifs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
