First, thanks for an interesting test plan. Just a quick note (I currently don't have time for retesting): On Wednesday 22 June 2005 03:41, Eli Billauer wrote: > And finally: Does an RAM FIFO help? Surprisingly, the answer is no.
Since you use stdio (fwrite), which by default does full buffering in user space (c.f: setvbuf(3)) this does not surprise me. Repeating the test with open/write/close etc, would give more significant results (altough I suspect they would only be worse :-( Tzahi mentioned XFS. While I'm not sure XFS would help with small write chunks (Reiserfs seems like better candidate for these), I'd like to mention a related feature the original XFS had on Irix (I think this feature wasn't ported to Linux) -- You could assign a special sub-volume in the filesystem as "real-time". The kernel would then give absolute priority to I/O requests related to that sub-volume -- In marketing speech this would give you "guaranteed I/O response time" (although I don't remember seeing any specific constraints on this [that's why I call it "marketing"]). Any other ideas anybody? -- Oron Peled Voice/Fax: +972-4-8228492 [EMAIL PROTECTED] http://www.actcom.co.il/~oron ICQ UIN: 16527398 "If I have been able to see farther, it was only because I stood on the shoulders of giants." -- Sir Isaac Newton -------------------------------------------------------------------------- Haifa Linux Club Mailing List (http://www.haifux.org) To unsub send an empty message to [EMAIL PROTECTED]
