> -Original Message-
> From: Dexuan Cui
> Sent: Sunday, September 6, 2015 4:48 AM
> To: Greg Kroah-Hartman ; Vitaly Kuznetsov
>
> Cc: Jiri Slaby ; linux-ser...@vger.kernel.org; linux-
> ker...@vger.kernel.org; KY Srinivasan ; Peter Hurley
>
> Subject: RE: [P
> -Original Message-
> From: Greg Kroah-Hartman
> Sent: Saturday, September 5, 2015 0:10
> On Fri, Sep 04, 2015 at 09:19:38AM +0200, Vitaly Kuznetsov wrote:
> > Greg Kroah-Hartman writes:
> >
> > > On Mon, Aug 31, 2015 at 04:34:16PM +0200, Vitaly Kuznetsov wrote:
> > >> Hyper-V serial port
> -Original Message-
> From: Greg Kroah-Hartman
> Sent: Saturday, September 5, 2015 0:10
> On Fri, Sep 04, 2015 at 09:19:38AM +0200, Vitaly Kuznetsov wrote:
> > Greg Kroah-Hartman writes:
> >
> > > On Mon, Aug 31, 2015 at 04:34:16PM +0200, Vitaly Kuznetsov wrote:
> > >> Hyper-V serial port
linux-
> ker...@vger.kernel.org; KY Srinivasan <k...@microsoft.com>; Peter Hurley
> <pe...@hurleysoftware.com>
> Subject: RE: [PATCH] serial: core: prevent softlockups on slow consoles
>
> > -Original Message-
> > From: Greg Kroah-Hartman
> > Sent: Saturda
On Fri, Sep 04, 2015 at 09:19:38AM +0200, Vitaly Kuznetsov wrote:
> Greg Kroah-Hartman writes:
>
> > On Mon, Aug 31, 2015 at 04:34:16PM +0200, Vitaly Kuznetsov wrote:
> >> Hyper-V serial port is very slow on multi-vCPU guest, this causes
> >> soflockups on intensive console writes. Touch nmi
On 09/04/2015 03:19 AM, Vitaly Kuznetsov wrote:
> Greg Kroah-Hartman writes:
>> I don't like this, please narrow this down to the real problem that your
>> hardware has here, the putchar function should not be this slow. If it
>> is, something is wrong.
>
> I'm afraid this is really the case:
Greg Kroah-Hartman writes:
> On Mon, Aug 31, 2015 at 04:34:16PM +0200, Vitaly Kuznetsov wrote:
>> Hyper-V serial port is very slow on multi-vCPU guest, this causes
>> soflockups on intensive console writes. Touch nmi watchdog after putting
>> every char on port to avoid the issue for all serial
On 09/04/2015 03:19 AM, Vitaly Kuznetsov wrote:
> Greg Kroah-Hartman writes:
>> I don't like this, please narrow this down to the real problem that your
>> hardware has here, the putchar function should not be this slow. If it
>> is, something is wrong.
>
> I'm
On Fri, Sep 04, 2015 at 09:19:38AM +0200, Vitaly Kuznetsov wrote:
> Greg Kroah-Hartman writes:
>
> > On Mon, Aug 31, 2015 at 04:34:16PM +0200, Vitaly Kuznetsov wrote:
> >> Hyper-V serial port is very slow on multi-vCPU guest, this causes
> >> soflockups on intensive
Greg Kroah-Hartman writes:
> On Mon, Aug 31, 2015 at 04:34:16PM +0200, Vitaly Kuznetsov wrote:
>> Hyper-V serial port is very slow on multi-vCPU guest, this causes
>> soflockups on intensive console writes. Touch nmi watchdog after putting
>> every char on port to
On Mon, Aug 31, 2015 at 04:34:16PM +0200, Vitaly Kuznetsov wrote:
> Hyper-V serial port is very slow on multi-vCPU guest, this causes
> soflockups on intensive console writes. Touch nmi watchdog after putting
> every char on port to avoid the issue for all serial drivers, the overhead
> should be
On Mon, Aug 31, 2015 at 04:34:16PM +0200, Vitaly Kuznetsov wrote:
> Hyper-V serial port is very slow on multi-vCPU guest, this causes
> soflockups on intensive console writes. Touch nmi watchdog after putting
> every char on port to avoid the issue for all serial drivers, the overhead
> should be
Peter Hurley writes:
> Hi Vitaly,
>
> On 08/31/2015 10:34 AM, Vitaly Kuznetsov wrote:
>> Hyper-V serial port is very slow on multi-vCPU guest
>
> How slow and why?
>
Not sure why, but here is a trace:
1) | serial8250_console_putchar() {
1) |
Hi Vitaly,
On 08/31/2015 10:34 AM, Vitaly Kuznetsov wrote:
> Hyper-V serial port is very slow on multi-vCPU guest
How slow and why?
> this causes
> soflockups on intensive console writes. Touch nmi watchdog after putting
> every char on port to avoid the issue for all serial drivers, the
Peter Hurley writes:
> Hi Vitaly,
>
> On 08/31/2015 10:34 AM, Vitaly Kuznetsov wrote:
>> Hyper-V serial port is very slow on multi-vCPU guest
>
> How slow and why?
>
Not sure why, but here is a trace:
1) |
Hi Vitaly,
On 08/31/2015 10:34 AM, Vitaly Kuznetsov wrote:
> Hyper-V serial port is very slow on multi-vCPU guest
How slow and why?
> this causes
> soflockups on intensive console writes. Touch nmi watchdog after putting
> every char on port to avoid the issue for all serial drivers, the
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