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[PATCH net] vhost: net: switch to use data copy if pending DMAs exceed the limit
2014 Feb 26
2
[PATCH net] vhost: net: switch to use data copy if pending DMAs exceed the limit
On 02/26/2014 02:32 PM, Qin Chuanyu wrote: > On 2014/2/26 13:53, Jason Wang wrote: >> On 02/25/2014 09:57 PM, Michael S. Tsirkin wrote: >>> On Tue, Feb 25, 2014 at 02:53:58PM +0800, Jason Wang wrote: >>>> We used to stop the handling of tx when the number of pending DMAs >>>> exceeds VHOST_MAX_PEND. This is used to reduce the memory occupation
[PATCH net] vhost: net: switch to use data copy if pending DMAs exceed the limit
2014 Feb 26
2
[PATCH net] vhost: net: switch to use data copy if pending DMAs exceed the limit
On 02/26/2014 02:32 PM, Qin Chuanyu wrote: > On 2014/2/26 13:53, Jason Wang wrote: >> On 02/25/2014 09:57 PM, Michael S. Tsirkin wrote: >>> On Tue, Feb 25, 2014 at 02:53:58PM +0800, Jason Wang wrote: >>>> We used to stop the handling of tx when the number of pending DMAs >>>> exceeds VHOST_MAX_PEND. This is used to reduce the memory occupation
[PATCH net] vhost: net: switch to use data copy if pending DMAs exceed the limit
2014 Feb 26
2
[PATCH net] vhost: net: switch to use data copy if pending DMAs exceed the limit
On 02/25/2014 09:57 PM, Michael S. Tsirkin wrote: > On Tue, Feb 25, 2014 at 02:53:58PM +0800, Jason Wang wrote: >> We used to stop the handling of tx when the number of pending DMAs >> exceeds VHOST_MAX_PEND. This is used to reduce the memory occupation >> of both host and guest. But it was too aggressive in some cases, since >> any delay or blocking of a single packet
[PATCH net] vhost: net: switch to use data copy if pending DMAs exceed the limit
2014 Feb 26
2
[PATCH net] vhost: net: switch to use data copy if pending DMAs exceed the limit
On 02/25/2014 09:57 PM, Michael S. Tsirkin wrote: > On Tue, Feb 25, 2014 at 02:53:58PM +0800, Jason Wang wrote: >> We used to stop the handling of tx when the number of pending DMAs >> exceeds VHOST_MAX_PEND. This is used to reduce the memory occupation >> of both host and guest. But it was too aggressive in some cases, since >> any delay or blocking of a single packet
[PATCH net] vhost: net: switch to use data copy if pending DMAs exceed the limit
2014 Feb 27
1
[PATCH net] vhost: net: switch to use data copy if pending DMAs exceed the limit
On 02/26/2014 05:23 PM, Michael S. Tsirkin wrote: > On Wed, Feb 26, 2014 at 03:11:21PM +0800, Jason Wang wrote: >> > On 02/26/2014 02:32 PM, Qin Chuanyu wrote: >>> > >On 2014/2/26 13:53, Jason Wang wrote: >>>> > >>On 02/25/2014 09:57 PM, Michael S. Tsirkin wrote: >>>>> > >>>On Tue, Feb 25, 2014 at 02:53:58PM +0800, Jason
[PATCH net] vhost: net: switch to use data copy if pending DMAs exceed the limit
2014 Feb 27
1
[PATCH net] vhost: net: switch to use data copy if pending DMAs exceed the limit
On 02/26/2014 05:23 PM, Michael S. Tsirkin wrote: > On Wed, Feb 26, 2014 at 03:11:21PM +0800, Jason Wang wrote: >> > On 02/26/2014 02:32 PM, Qin Chuanyu wrote: >>> > >On 2014/2/26 13:53, Jason Wang wrote: >>>> > >>On 02/25/2014 09:57 PM, Michael S. Tsirkin wrote: >>>>> > >>>On Tue, Feb 25, 2014 at 02:53:58PM +0800, Jason
[PATCH net] vhost: net: switch to use data copy if pending DMAs exceed the limit
2014 Feb 26
0
[PATCH net] vhost: net: switch to use data copy if pending DMAs exceed the limit
On Wed, Feb 26, 2014 at 03:11:21PM +0800, Jason Wang wrote: > On 02/26/2014 02:32 PM, Qin Chuanyu wrote: > >On 2014/2/26 13:53, Jason Wang wrote: > >>On 02/25/2014 09:57 PM, Michael S. Tsirkin wrote: > >>>On Tue, Feb 25, 2014 at 02:53:58PM +0800, Jason Wang wrote: > >>>>We used to stop the handling of tx when the number of pending DMAs >
[PATCH net] vhost: net: switch to use data copy if pending DMAs exceed the limit
2014 Feb 26
0
[PATCH net] vhost: net: switch to use data copy if pending DMAs exceed the limit
On 2014/2/26 13:53, Jason Wang wrote: > On 02/25/2014 09:57 PM, Michael S. Tsirkin wrote: >> On Tue, Feb 25, 2014 at 02:53:58PM +0800, Jason Wang wrote: >>> We used to stop the handling of tx when the number of pending DMAs >>> exceeds VHOST_MAX_PEND. This is used to reduce the memory occupation >>> of both host and guest. But it was too aggressive in some
[PATCH net] vhost: net: switch to use data copy if pending DMAs exceed the limit
2014 Feb 25
2
[PATCH net] vhost: net: switch to use data copy if pending DMAs exceed the limit
We used to stop the handling of tx when the number of pending DMAs exceeds VHOST_MAX_PEND. This is used to reduce the memory occupation of both host and guest. But it was too aggressive in some cases, since any delay or blocking of a single packet may delay or block the guest transmission. Consider the following setup: +-----+ +-----+ | VM1 | | VM2 | +--+--+
[PATCH net] vhost: net: switch to use data copy if pending DMAs exceed the limit
2014 Feb 25
2
[PATCH net] vhost: net: switch to use data copy if pending DMAs exceed the limit
We used to stop the handling of tx when the number of pending DMAs exceeds VHOST_MAX_PEND. This is used to reduce the memory occupation of both host and guest. But it was too aggressive in some cases, since any delay or blocking of a single packet may delay or block the guest transmission. Consider the following setup: +-----+ +-----+ | VM1 | | VM2 | +--+--+