![]() Now, I wasn't familiar with KVM (I'm more of a Windows guy). From that link, I Googled "virtio-net", which led me to Virtio KVM. there really isn't much to work with there. ![]() but it's about "www_virtualbox_org/manual/ch06_html")Īs you can see. (ok, as a new member, I can't post a link. In fact, this is the documentation I found: ![]() The VirtualBox documentation I found on it was quite minimal. the whole "paravirtual" approach is pretty confusing to me. I thought buying dedicated NIC's would solve my problem. Note that on the Host machine, downloads don't seem to be significantly affected by the number of running VM. However, as soon as I open up a second VM, Network performance becomes extremely erratic on BOTH VM's and my downloads often fail. When I launch my first Windows VM, the Network performance on that VM is fine. On the NIC card dedicated to the Host, I've unchecked the "VirtualBox Bridged Networking Driver". On each of the dedicated VM NIC card, on the host machine, I've unchecked ALL Network options EXCEPT the "Virtual Bridged Networking Driver". All VM Network settings are configured with "Bridged Adapter" and each VM uses a dedicated NIC card. Each VM System's settings has the "Enable I/O APIC", "Enable PAE/NX", "Enable VT-x/AMD-V" and "Enable Nested Paging" settings Set. Clients OSes - Multiple Windows 7 圆4 Professional (issue shows up as soon as I have more than 1 VM, actually) VirtualBox 4.3.26 r98988 with the corresponding VBoxGuestAdditions on the guest machines All the BIOS settings for Virtualization have been set. So my VMs are now usable under v7.0.12 even though the write performance is still lousy.This has been driving me insane and I just can't find the answer anywhere.Ĭomputer runs Intel Core i7 5960x (8 Cores), 32 GB of Ram and the main board is an ASRock X99m Killer. With the NAT adapter, the read performance was the same as the Host performance at 114 MB/s. ![]() In that test (paravirtualized driver + bridged mode) however, read performance was still abysmal at 0.428 MB/s. So I tried that with the previous Intel PRO/1000 MT Desktop adapter type, and my file write performance increased to 2.5 MB/s or approx the same as my test using a paravirtualized adapter type. One of the posts said the problem disappeared when using a NAT adapter instead of a Bridged Adapter. The common issue I see is that it occurs with VBox bridged adapters and Intel physical adapters on the Host. Some issues are for LAN connections and some are for WAN connections. These seem to occur with many different Host and Guest operating systems. It came up with numerous issues related to very slow network transfer speeds with VBox v7.0.x going back to June. ![]() I did an advanced search this morning across all forums for: Searched query: +slow +network Win7 Pro General (40.19 KiB) Downloaded 8 times The Host is using a cifs mount to connect to the same folder on the NAS.ĭo I need to make some kind of Guest configuration change when moving from VBox v6 to v7? The read speed with the paravirtualized adapter is also much slower than the write speed.īoth Guests are using a Mapped Network Drive to connect to the NAS folder. This was a huge improvement, but still far below the Host transfer speed: So, I upgraded one of the two Guests from the Intel Adapter to a Paravirtualized Network Adapter. I copied the same file from the Host to the same NAS folder in 0.48 seconds:ĥ0331648 bytes (50 MB, 48 MiB) copied, 0.482932 s, 104 MB/sĬopying the file from the NAS to the Host produced a similar result:ĥ0331648 bytes (50 MB, 48 MiB) copied, 0.441563 s, 114 MB/s I ran DiskBench.exe on both Guests and had similar results - attempting to copy a 50 MB file from the Guest to a folder on the NAS resulted in only 3.8 MB copied after 4 hours. Initially both Guests were using a Intel PRO/1000 MT Desktop Adapter. When GA v7.0.13 was released, I upgraded to that version and still have the same problem. Intel NUC: 13th Gen Intel(R) Core(TM) i5-1340Pīoth Guests were running GA v7.0.10 because of the bug in GA v7.0.12 with Win7 and experiencing the issue. I have two Windows 7 Guests running on a Debian 12 Desktop PC.Īfter upgrading to VirtualBox 7, I am experiencing very slow file transfers from the Guests to a NAS. ![]()
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