Messages in this thread | | | Date | Tue, 07 Oct 2003 18:21:06 +0200 | From | Stefan Kaltenbrunner <> | Subject | Serverworks CSB5 IDE-DMA Problem (2.4 and 2.6) |
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Hello!
we have a bunch of IBM x305 here which are entrylevel 1HE servers based on a Serverworks CSB5 chipset. One of those has 2 120GB IDE disks in a software RAID1 and the main userspace-application is a heavly (mostly insert/update) used postgresql-database. The database generates a lot of sustained IO-traffic and after some minutes (depends on the load - sometimes it even works for one or two hours) the kernel generates the following messages(2.4.22 and 2.6.0-test6 behave almost identically - error-messages are from 2.6.0-test6):
hdc: dma_timer_expiry: dma status == 0x20 hdc: DMA timeout retry hdc: timeout waiting for DMA hdc: status timeout: status=0xd0 { Busy }
hdc: drive not ready for command ide1: reset: success hdc: dma_timer_expiry: dma status == 0x20 hdc: DMA timeout retry hdc: timeout waiting for DMA hdc: status timeout: status=0xd0 { Busy }
hdc: drive not ready for command ide1: reset: success hdc: dma_timer_expiry: dma status == 0x20 hdc: DMA timeout retry hdc: timeout waiting for DMA hdc: status timeout: status=0xd0 { Busy }
hdc: drive not ready for command ide1: reset: success hdc: dma_timer_expiry: dma status == 0x20 hdc: DMA timeout retry hdc: timeout waiting for DMA hdc: status timeout: status=0xd0 { Busy }
hdc: drive not ready for command ide1: reset: success hda: dma_timer_expiry: dma status == 0x60 hda: DMA timeout retry hda: timeout waiting for DMA hda: status timeout: status=0xd0 { Busy }
hdb: DMA disabled hda: drive not ready for command ide0: reset: success blk: queue dfdee200, I/O limit 4095Mb (mask 0xffffffff) hda: dma_timer_expiry: dma status == 0x20 hda: DMA timeout retry hda: timeout waiting for DMA hda: status timeout: status=0xd0 { Busy }
hda: drive not ready for command ide0: reset: success hda: dma_timer_expiry: dma status == 0x20 hda: DMA timeout retry hda: timeout waiting for DMA hda: status timeout: status=0xd0 { Busy }
hda: drive not ready for command ide0: reset: success
after one of this events DMA on one of the disks (either hdc or hda) gets disabled and the maschine is heavily overloaded and the database cannot keep up any more with the incoming load of database-updates. It's also worth mentioning that the kernel reports a "DMA disabled" only for hdb which is the internal cd-drive and completely unused.
I do know that Serverworks IDE has been flaky (especially with the CSB4) in the past but I thought this had been fixed in newer chipset-revisions - is there anything I can do to solve this problem?
dmesg of the machine in question can be found at http://www.kaltenbrunner.cc/files/dmesg.txt
many thanks
Stefan Kaltenbrunner
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