2C from Oz: Windows (at least XP - I have thus far been lucky enough to avoid running vista on metal) has packet schedulers, quality of service settings and other crap that can severely impact windows performance on the network.
I have found that setting the following made a difference to me: - Disable Jumbo Frames (as I have only a very cheap crappy gig-switch and if I try to drive it hard with jumbo's enabled, it falls in a heap) - Lose the 'deterministic network enhancer' under windows - Lose the QoS packet scheduler - Check the interface properties and go looking for something that sounds like 'optimize for CPU / optimize for speed' and set it to speed - Depending on workload and packet sizes, it might also be worth looking at disabling nagle algorithm on the Solaris box. See http://www.sun.com/servers/coolthreads/tnb/lighttpd.jsp for a quick explanation... It would be interesting to see if you see the same issues using a Solaris or other OS client. Hope this helps somewhat. Let us know how it goes. Nathan. fredrick phol wrote: > I'm currently experiencing exactly the same problem and it's been driving me > nuts. Tried open soalris and am currently running the latest version of SXCE > both with exactly the same results. > > This issue occurs with both CIFS which shows the speed degrade and ISCSI > which just starts off at the lowest speed but exhibits the same peaks and > troughs > > I have 4x500GB drives in RAIDz1 config on an AMD 780G mobo. > > speed tests using DD have shown read rates of ~140MB/s and write rates of > `120MB/s (humourously slightly faster than one of my friends arrays on linux > and intel hardware) > > Currently the transfer will sit at about 18% gige network utilisation for 10 > seconds then dip to 0 and come straight back up to 18% this happens at > regular predictable intervals, there is no randomness. I've tried two > different switches, one a consumer grade switch from linksys and one a low > end distribution switch from 3com both exhibit exactly the same behaviour. > > The only computer accessing the solaris box is w windows vista 64 sp1 machine. > > Currently I'm guessing that the transfer issues have somethign to do with the > onboard realtek network card in the solaris box. Possibly a driver issue? > I've got a dual port intel server nic on order to replace it and test with. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
