Bug 660584
| Summary: | NFS transfer is very slow when RHEL5.5 guest's nic type is RTL8139 | ||||||
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| Product: | Red Hat Enterprise Linux 5 | Reporter: | Qingtang Zhou <qzhou> | ||||
| Component: | kvm | Assignee: | jason wang <jasowang> | ||||
| Status: | CLOSED WONTFIX | QA Contact: | Virtualization Bugs <virt-bugs> | ||||
| Severity: | medium | Docs Contact: | |||||
| Priority: | low | ||||||
| Version: | 5.6 | CC: | gcosta, jasowang, michen, mkenneth, rhod, virt-maint | ||||
| Target Milestone: | rc | Keywords: | Triaged | ||||
| Target Release: | --- | ||||||
| Hardware: | Unspecified | ||||||
| OS: | Unspecified | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2011-07-31 13:23:54 UTC | Type: | --- | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Embargoed: | |||||||
| Bug Depends On: | |||||||
| Bug Blocks: | 580946 | ||||||
| Attachments: |
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*** Bug 660582 has been marked as a duplicate of this bug. *** *** Bug 660583 has been marked as a duplicate of this bug. *** Created attachment 465185 [details]
dmesg output on guest os
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Description of problem: When installing OS on guest which have a rtl8139 card via NFS, I found a lot of packets is retransmitted or timeout, and file transmission via NFS is very slow. Then I changed nic type to e1000, file transfer speed is back to normal. public net. private net with a private bridge. NFSServer-------------- Host(RHEL5.6)--------------Guest(RHEL5.5) Version-Release number of selected component: # rpm -q kernel kernel-2.6.18-233.el5 # rpm -q kvm kvm-83-219.el5 How reproducible: 100% Steps to Reproduce: 1. Start a VM with following command, and start a unattended_install: qemu -name 'vm1' -monitor unix:'/tmp/monitor-humanmonitor1-20101204-045808-YVkj',server,nowait -serial unix:'/tmp/serial-20101204-045808-YVkj',server,nowait -drive file='RHEL-Server-5.5-64.qcow2',index=0,if=ide,media=disk,cache=none,format=qcow2 -net nic,vlan=0,model=rtl8139,macaddr='9a:25:00:89:f2:49' -net tap,vlan=0,ifname='t0-045808-YVkj',script='qemu-ifup-vbr0',downscript='no' -m 4096 -smp 2,cores=1,threads=1,sockets=2 -drive file='rhel5-64/ks.iso',media=cdrom,index=1 -cpu qemu64,+sse2 -soundhw ac97 -kernel '/usr/local/staf/test/RHEV/kvm-new/autotest/client/tests/kvm/vmlinuz' -initrd '/usr/local/staf/test/RHEV/kvm-new/autotest/client/tests/kvm/initrd.img' -vnc :0 -spice port=8000,disable-ticketing -qxl 1 -rtc-td-hack -M rhel5.5.0 -usbdevice tablet -append 'ks=cdrom console=ttyS0,115200 console=tty0' -no-kvm-pit-reinjection 2. tcpdump on the tap device guest created. 3. installation is slow, and many retransmission. Actual results: file transmission speed is slow, packet retransmission. Expected results: nearly no packet retransmission, file transmission speed is normal. Additional info: dmesg on guest os is attached.