Bug 950424
| Summary: | [NetKVM] Verify indirect buffers support on the host for RX | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | Yvugenfi <yvugenfi> |
| Component: | virtio-win | Assignee: | Dmitry Fleytman <dfleytma> |
| Status: | CLOSED ERRATA | QA Contact: | Virtualization Bugs <virt-bugs> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 6.5 | CC: | acathrow, bcao, bsarathy, dfleytma, juzhang, lijin, lnovich, mdeng, michen, qzhang, virt-bugs, yvugenfi |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Enhancement | |
| Doc Text: |
Feature:
Use virtio indirect buffers feature in guest driver.
Reason:
Enhanced virtio capability to transfer fragmented network traffic.
Result (if any):
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2013-11-22 00:07:22 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
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Description
Yvugenfi@redhat.com
2013-04-10 08:43:04 UTC
Yan, Could you provide way to reproduce/verify it ? Hi Mike, What you need is to run NetKVM driver on old QEMU without "indirect buffers" feature support. Before this fix driver will not work or will even crash, at least there will be no RX packets. With this fix everything should work smoothly. Yan, please help us with exact QEMU version number indirect buffers were introduced at. Thanks, Dmitry failed to reproduce it on virtio-win-prwehql-49 steps 1.Start VM w/ virtio-net-pci with indirect_desc=off CLI: /usr/libexec/qemu-kvm -m 2G -smp 2 -usb -device usb-tablet,id=tablet0 -drive file=/home/win7-64-virtio.qcow2,if=none,id=drive-virtio0-0-0,format=qcow2,werror=stop,rerror=stop,cache=none -device ide-drive,drive=drive-virtio0-0-0,id=virti0-0-0,bootindex=1 -netdev tap,id=hostnet0,script=/etc/qemu-ifup -device virtio-net-pci,indirect_desc=off,netdev=hostnet0,id=net0,mac=00:12:10:94:a3:f8 -uuid 8677bf9b-3cf6-47a1-b3e9-94213b801c87 -monitor stdio -vnc :7 -device virtio-serial-pci,id=virtio-serial0,max_ports=16 -chardev socket,id=channel1,path=/tmp/helloworld1,server,nowait -device virtserialport,chardev=channel1,name=com.redhat.rhevm.vdsm1,bus=virtio-serial0.0,id=port1 -chardev socket,id=channel2,path=/tmp/helloworld2,server,nowait -device virtserialport,chardev=channel2,name=com.redhat.rhevm.vdsm2,bus=virtio-serial0.0,id=port2 -global PIIX4_PM.disable_s3=0 -global PIIX4_PM.disable_s4=0 2.Copy File From Host to Guest Actual Results: Guest Could receive data successfully Dima ,Could you view my steps above ?Could you give me some other suggestions ? Thanks, According to Amos -device virtio-net-pci,indirect_desc=off is to disable indirect buffers Hello Mike, The problem is the same as in BZ957507 - this command line option doesn't disable indirect buffers feature but hides it. Since old driver doesn't verify feature presence it uses it successfully. Regards, Dmitry QE run netkvm functional test ,did not find any issue on disable\enable load\unload Based on above ,this issue has been fixed ald .Move status to VERIFIED. Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHBA-2013-1729.html |