8:26 a.m.
Hello,
today I disovered, that e1000 cards has very poor performance in Fedora 18
and 19. Does not matter, if guest is an Linux or other system.
By "poor" I mean TCP network transfers about 5-90 kB/s, even if they are on
an gigabit network.
By downgrading kernel on Fedora 19 from 3.10.X to
kernel-3.9.5-301.fc19.x86_64 fixed my problem, so looks like there
is an bug in kernel. I tested these kernels:
Fast:
kernel-3.9.5-301.fc19.x86_64
Slow:
kernel-3.10.7-100.fc18.x86_64
kernel-3.10.9-100.fc18.x86_64
kernel-3.10.10-200.fc19.x86_64
Looks like it is an change with kernel-3.10.X. I can test other kernels if
requested.
For me, it's easy to reproduce. Tested on 4 host machines, 2 Fedoras,
multiple kernels and different guests. Also tested some network cards,
e1000, pcnet, ... All with similar problems.
As described in other bug, virtio net driver has time skew problems, so
I can't use it. :-(
Any ideas, how to solve this problem?
Regards
SAL
2:21 p.m.
On Fri, Sep 06, 2013 at 12:22:45AM +0530, Amit Shah wrote:
On (Thu) 05 Sep 2013 [15:26:52], Ján ONDREJ (SAL) wrote:
> As described in other bug, virtio net driver has time skew problems, so
> I can't use it. :-(
Please share details -- link to bug report or mail list post.
Thread 2 month ago here:
https://lists.fedoraproject.org/pipermail/virt/2013-July/003714.html
or rhbz:
https://bugzilla.redhat.com/show_bug.cgi?id=982459
Btw, latest 3.9 kernel for fc18 works well:
kernel-3.9.11-200.fc18.x86_64 - fast network speed
SAL
2:36 p.m.
On (Thu) 05 Sep 2013 [21:21:00], Ján ONDREJ (SAL) wrote:
On Fri, Sep 06, 2013 at 12:22:45AM +0530, Amit Shah wrote:
> On (Thu) 05 Sep 2013 [15:26:52], Ján ONDREJ (SAL) wrote:
>
> > As described in other bug, virtio net driver has time skew problems, so
> > I can't use it. :-(
>
> Please share details -- link to bug report or mail list post.
Thread 2 month ago here:
https://lists.fedoraproject.org/pipermail/virt/2013-July/003714.html
or rhbz:
https://bugzilla.redhat.com/show_bug.cgi?id=982459
Btw, latest 3.9 kernel for fc18 works well:
kernel-3.9.11-200.fc18.x86_64 - fast network speed
That thread and bug says you have problems with virtio and Windows
guests. You're here saying the kernel version matters. Does this
mean that the host kernel version matters for you when you use e1000
or virtio-net cards with Windows guests?
Amit
12:40 a.m.
On Fri, Sep 06, 2013 at 01:06:04AM +0530, Amit Shah wrote:
On (Thu) 05 Sep 2013 [21:21:00], Ján ONDREJ (SAL) wrote:
> On Fri, Sep 06, 2013 at 12:22:45AM +0530, Amit Shah wrote:
> > On (Thu) 05 Sep 2013 [15:26:52], Ján ONDREJ (SAL) wrote:
> >
> > > As described in other bug, virtio net driver has time skew problems, so
> > > I can't use it. :-(
> >
> > Please share details -- link to bug report or mail list post.
>
> Thread 2 month ago here:
>
> https://lists.fedoraproject.org/pipermail/virt/2013-July/003714.html
>
> or rhbz:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=982459
>
> Btw, latest 3.9 kernel for fc18 works well:
> kernel-3.9.11-200.fc18.x86_64 - fast network speed
That thread and bug says you have problems with virtio and Windows
guests. You're here saying the kernel version matters. Does this
mean that the host kernel version matters for you when you use e1000
or virtio-net cards with Windows guests?
Time skew problems are not kernel specific, this bug is prensent always.
But this happens only if virtio-net windows driver is installed in guest.
Slow network for e1000 and possibly other network cards is kernel specific.
Kernels 3.10+ on hosts.
Btw, another bug in 3.9.11. One guest stopped to communicate on
ethernet. When trying to restart it, shutdown completed, but qemu process is
still running in "D" (dead) state on host. Unable to kill it. :-(
Which Fedora kernel should be fully functional? :-)
At our university we are using Fedora host over years, using mostly linux
guests, but also some windows. My problems started with 3.10 kernels.
I don't remember, which 3.9 kernel I used before.
SAL
12:47 a.m.
On (Fri) 06 Sep 2013 [07:40:52], Ján ONDREJ (SAL) wrote:
On Fri, Sep 06, 2013 at 01:06:04AM +0530, Amit Shah wrote:
> On (Thu) 05 Sep 2013 [21:21:00], Ján ONDREJ (SAL) wrote:
> > On Fri, Sep 06, 2013 at 12:22:45AM +0530, Amit Shah wrote:
> > > On (Thu) 05 Sep 2013 [15:26:52], Ján ONDREJ (SAL) wrote:
> > >
> > > > As described in other bug, virtio net driver has time skew problems,
so
> > > > I can't use it. :-(
> > >
> > > Please share details -- link to bug report or mail list post.
> >
> > Thread 2 month ago here:
> >
> > https://lists.fedoraproject.org/pipermail/virt/2013-July/003714.html
> >
> > or rhbz:
> >
> > https://bugzilla.redhat.com/show_bug.cgi?id=982459
> >
> > Btw, latest 3.9 kernel for fc18 works well:
> > kernel-3.9.11-200.fc18.x86_64 - fast network speed
>
> That thread and bug says you have problems with virtio and Windows
> guests. You're here saying the kernel version matters. Does this
> mean that the host kernel version matters for you when you use e1000
> or virtio-net cards with Windows guests?
Time skew problems are not kernel specific, this bug is prensent always.
But this happens only if virtio-net windows driver is installed in guest.
Slow network for e1000 and possibly other network cards is kernel specific.
Kernels 3.10+ on hosts.
Can you try Linux guests?
Btw, another bug in 3.9.11. One guest stopped to communicate on
ethernet. When trying to restart it, shutdown completed, but qemu process is
still running in "D" (dead) state on host. Unable to kill it. :-(
Which Fedora kernel should be fully functional? :-)
At our university we are using Fedora host over years, using mostly linux
guests, but also some windows. My problems started with 3.10 kernels.
I don't remember, which 3.9 kernel I used before.
Could also be something related to your setup; haven't seen such bugs
elsewhere.
Amit
8:33 a.m.
On 09/05/2013 09:26 AM, Ján ONDREJ (SAL) wrote:
Hello,
today I disovered, that e1000 cards has very poor performance in Fedora 18
and 19. Does not matter, if guest is an Linux or other system.
By "poor" I mean TCP network transfers about 5-90 kB/s, even if they are on
an gigabit network.
By downgrading kernel on Fedora 19 from 3.10.X to
kernel-3.9.5-301.fc19.x86_64 fixed my problem, so looks like there
is an bug in kernel. I tested these kernels:
Fast:
kernel-3.9.5-301.fc19.x86_64
Slow:
kernel-3.10.7-100.fc18.x86_64
kernel-3.10.9-100.fc18.x86_64
kernel-3.10.10-200.fc19.x86_64
Looks like it is an change with kernel-3.10.X. I can test other kernels if
requested.
For me, it's easy to reproduce. Tested on 4 host machines, 2 Fedoras,
multiple kernels and different guests. Also tested some network cards,
e1000, pcnet, ... All with similar problems.
As described in other bug, virtio net driver has time skew problems, so
I can't use it. :-(
Any ideas, how to solve this problem?
I haven't heard anything about this myself, maybe the kernel guys have a
better idea. Unless you want to try git bisect, best thing to do is file a
fedora kernel bug or try your luck upstream
- Cole
3904
days inactive
3910
days old
6 comments
3 participants
participants (3)
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Amit Shah -
Cole Robinson -
Ján ONDREJ (SAL)