Re: KVM-74 and network timeout?
Sean Mahrt wrote: I’ve noticed the guest with a lot of Disk I/O (commercial detection) after a while has a lot of NFS timeouts…. Virtio or E1000 give me the same result. I noticed exactly the same problem after moving from kvm-64 on a 2.6.25.3 host to kvm-74 on a 2.6.26.3 host. Adding to your observations: - CIFS shares are affected as well: Under heavy traffic I get timeouts from the server, see [1] - ne2k_pci and rtl8139 guests seem to be affected as well Now the real bad part, I’m getting pings in the order of ms, like 20-100ms on a bridged connection… and NFS is going crazy... My pings also increased from 0.1ms to 16ms when the physical interface of the bridge was maxed out. Don't know, whether transferring from VM to VM would also trigger that. I’m using smp on the guests (and the host), and 2.6.25 on the guests… My guests where UP and mostly Windows Server 2003 and one Gentoo 2.6.26, so I think the culprit is elsewhere. Where should I start looking? Is this a KVM-74 issue? Bump to KVM-75? You might try kvm-64 which is rock-solid for me when paired with a 2.6.25 KVM kernel module. [1] Sep 6 17:42:58 [EMAIL PROTECTED] CIFS VFS: server not responding Sep 6 17:42:58 [EMAIL PROTECTED] CIFS VFS: No response to cmd 46 mid 30836 Sep 6 17:42:58 [EMAIL PROTECTED] CIFS VFS: Send error in read = -11 Sep 6 17:51:28 [EMAIL PROTECTED] CIFS VFS: server not responding Sep 6 17:51:28 [EMAIL PROTECTED] CIFS VFS: No response for cmd 50 mid 30850 -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: KVM-74 and network timeout?
Hi, ive been using a JetFlash usb-storage device with kvm-qemu and Windows XP as a guest. I have seen that before setting up the device properly, Windows resets it 5 or 6 times, which makes the process awfully slow. Diving into the code I found that qemu's emulation was not giving the host the right status when there was a babble or stall situation. After applying the following patch the setup time was cut up by a ~200%. Cheers, Daniel --- old/kvm-75/qemu/usb-linux.c 2008-09-07 18:38:33.0 +0200 +++ new/kvm-75/qemu/usb-linux.c 2008-09-18 15:13:47.0 +0200 @@ -208,9 +208,13 @@ p-len = aurb-urb.actual_length; break; +case -EOVERFLOW: + p-len = USB_RET_BABBLE; + break; case -EPIPE: set_halt(s, p-devep); -/* fall through */ +p-len = USB_RET_STALL; + break; default: p-len = USB_RET_NAK; break; usb_fix.patch Description: Binary data
