Date: Sun, 18 May 2008 22:45:30 +0200 From: Daniel Ponticello <daniel@skytek.it> To: cliftonr@lava.net Cc: freebsd-stable@freebsd.org Subject: Re: Disk access/MPT under ESX3.5 Message-ID: <4830956A.80000@skytek.it> In-Reply-To: <20080518182827.GA18109@lava.net> References: <48303A1B.9000103@skytek.it> <20080518182827.GA18109@lava.net>
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Clifton Royston ha scritto: > > If you are accessing a software emulation of a SCSI disk, I would > offhand expect the CPU load to go up substantially when you are reading > or writing it at the maximum achievable bandwidth. You can't expect > normal relative load results under an emulator, and while most > application or kernel code runs natively, I/O under VMWare will zoom in > and out of the emulator a lot. I'm afraid I can't give you a > definitive answer as I have VMWare but haven't set up FreeBSD under it > yet. > > -- Clifton > Thanks Clifton, my problem is that system (console) becomes very unresponsive when I/O is writing at maximum bandwidth. Anyway, system becomes more responsive when using ULE scheduler instead of 4BSD during I/O. Is there a way to limit the maximum I/O bandwidth used by the controller? Daniel -- WBR, Cordiali Saluti, Daniel Ponticello, VP of Engineering Network Coordination Centre of Skytek --- - For further information about our services: - Please visit our website at http://www.Skytek.it ---
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