Date: Tue, 27 Mar 2007 19:04:25 +0100 From: Richard Tector <richardtector@thekeelecentre.com> To: Ivan Voras <ivoras@fer.hr> Cc: freebsd-stable@freebsd.org Subject: Re: Dell SAS5 Performance Issue Message-ID: <46095CA9.7060701@thekeelecentre.com> In-Reply-To: <eubm0p$bo7$1@sea.gmane.org> References: <460959E8.207@thekeelecentre.com> <eubm0p$bo7$1@sea.gmane.org>
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Ivan Voras wrote: > Richard Tector wrote: > >> I'm suffering from very slow write performance on a Dell PowerEdge 860 >> with the SAS5/IR controller (mpt driver) running either 6.2-RELEASE or >> 6.2-STABLE with sources from yesterday. The controller hosts 2 Western >> Digital 320GB SATA disks in a RAID1 configuration. >> Reads approach 65MB/s however writes appear extremely slow, in the >> region of 6-7MB/s with a dd and a blocksize of 1MB all the way down to >> about 300KB/s while extracting a ports snapshot. >> >> It was suggested to me that perhaps write caching has been disabled on >> the controller however no options exist within the BIOS configuration to >> view/adjust *any* caching options. >> > > You looked in the controller's BIOS, not motherboard's, right? Indeed I did. > There should be at least a "write through" vs "write back" switch... Correct, there should be options, but there aren't. The controller BIOS has very few options at all in fact. > No, but can you post the relevant bits for the controller from dmesg? > Sure: mpt0: <LSILogic SAS/SATA Adapter> port 0xec00-0xecff mem 0xfe9fc000-0xfe9fffff,0xfe9e0000-0xfe9effff irq 16 at device 8.0 on pci2 mpt0: [GIANT-LOCKED] mpt0: MPI Version=1.5.12.0 mpt0: mpt_cam_event: 0x16 mpt0: Unhandled Event Notify Frame. Event 0x16 (ACK not required). mpt0: mpt_cam_event: 0x12 mpt0: Unhandled Event Notify Frame. Event 0x12 (ACK not required). mpt0: mpt_cam_event: 0x12 mpt0: Unhandled Event Notify Frame. Event 0x12 (ACK not required). mpt0: mpt_cam_event: 0x16 mpt0: Unhandled Event Notify Frame. Event 0x16 (ACK not required). [...snip...] da0 at mpt0 bus 0 target 0 lun 0 da0: <Dell VIRTUAL DISK 1028> Fixed Direct Access SCSI-5 device da0: 300.000MB/s transfers, Tagged Queueing Enabled da0: 305175MB (624998400 512 byte sectors: 255H 63S/T 38904C) Regards, Richard
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