- Description of problem: Heavy I/O activity fails. The /var/log/messages shows the following error: "PCI-DMA: Out of SW-IOMMU space for 65536 bytes at device 0000:0d:00.0" "printk: 92 messages suppressed" This is repeated constantly as long as I/O is run. - Version-Release number of selected component (if applicable): 2.6.18-87.el5xen x86_64 qla2xxx "inbox driver" 8.02.00-K5-rhel5.2-04 - How reproducible: It is very reproducible. Error occurs every time I/O is run. - Steps to Reproduce: 1. Attach a Qlogic QLE2562 8G FC Adapter in server. Configure a Multipath configuration with EMC storage 2. Run heavy I/O (large file reads and writes, using Medusa Tools “Pain”) 3. Observe /var/log/messages file 4. The I/O fails with “I/O halt” messages Actual results: Expected results: - Additional info: similar bug was reported (Bug 219216) and was resolved by an errata kernel in Redhat 5.1. A sample of /var/log/messages, output of lspci showing the device in question and output of meminfo is attached. (IOMMU-ER.txt)
Created attachment 302151 [details] sample of /var/log/messages, output of lspci showing the device in question and output of meminfo
This should be fixed in the latest kernel build (-89) which will be in snapshot 5. In the meantime please try the -89 kernel availble here: http://people.redhat.com/bburns/kernel-xen-2.6.18-89.el5.x86_64.rpm Thanks
Probable duplicate of 433554.
The new Kernel provided (kernel-xen-2.6.18-89.el5.x86_64.rpm) has resolved the issue. There are no error messages related to IOMMU in the messages file.
*** This bug has been marked as a duplicate of 433554 ***
Thank! Marked as a duplicate.