On 11/4/20 4:51 AM, Eric Dumazet wrote:
>
>
> On 11/4/20 1:36 PM, Matthew Wilcox wrote:
>> On Wed, Nov 04, 2020 at 09:50:30AM +0100, Eric Dumazet wrote:
>>> On 11/4/20 2:16 AM, Rama Nichanamatlu wrote:
> Thanks for providing the numbers. Do you think that dropping (up to)
> 7 packets
On 11/4/20 1:36 PM, Matthew Wilcox wrote:
> On Wed, Nov 04, 2020 at 09:50:30AM +0100, Eric Dumazet wrote:
>> On 11/4/20 2:16 AM, Rama Nichanamatlu wrote:
Thanks for providing the numbers. Do you think that dropping (up to)
7 packets is acceptable?
>>>
>>> net.ipv4.tcp_syn_retries = 6
On Wed, Nov 04, 2020 at 09:50:30AM +0100, Eric Dumazet wrote:
> On 11/4/20 2:16 AM, Rama Nichanamatlu wrote:
> >> Thanks for providing the numbers. Do you think that dropping (up to)
> >> 7 packets is acceptable?
> >
> > net.ipv4.tcp_syn_retries = 6
> >
> > tcp clients wouldn't even get that
On 11/4/20 2:16 AM, Rama Nichanamatlu wrote:
>> Thanks for providing the numbers. Do you think that dropping (up to)
>> 7 packets is acceptable?
>
> net.ipv4.tcp_syn_retries = 6
>
> tcp clients wouldn't even get that far leading to connect establish issues.
This does not really matter. If
Thanks for providing the numbers. Do you think that dropping (up to)
7 packets is acceptable?
net.ipv4.tcp_syn_retries = 6
tcp clients wouldn't even get that far leading to connect establish issues.
-rama
On Tue, Nov 03, 2020 at 09:15:41PM +, Matthew Wilcox wrote:
On Tue, Nov 03, 2020
On 11/3/20 1:15 PM, Matthew Wilcox wrote:
> On Tue, Nov 03, 2020 at 12:57:33PM -0800, Dongli Zhang wrote:
>> On 11/3/20 12:35 PM, Matthew Wilcox wrote:
>>> On Tue, Nov 03, 2020 at 11:32:39AM -0800, Dongli Zhang wrote:
However, once kernel is not under memory pressure any longer (suppose
Hi Matthew,
On 11/3/20 12:35 PM, Matthew Wilcox wrote:
> On Tue, Nov 03, 2020 at 11:32:39AM -0800, Dongli Zhang wrote:
>> The ethernet driver may allocates skb (and skb->data) via napi_alloc_skb().
>> This ends up to page_frag_alloc() to allocate skb->data from
>> page_frag_cache->va.
>>
>>
On Tue, Nov 03, 2020 at 12:57:33PM -0800, Dongli Zhang wrote:
> On 11/3/20 12:35 PM, Matthew Wilcox wrote:
> > On Tue, Nov 03, 2020 at 11:32:39AM -0800, Dongli Zhang wrote:
> >> However, once kernel is not under memory pressure any longer (suppose large
> >> amount of memory pages are just
On Tue, Nov 03, 2020 at 11:32:39AM -0800, Dongli Zhang wrote:
> The ethernet driver may allocates skb (and skb->data) via napi_alloc_skb().
> This ends up to page_frag_alloc() to allocate skb->data from
> page_frag_cache->va.
>
> During the memory pressure, page_frag_cache->va may be allocated as
The ethernet driver may allocates skb (and skb->data) via napi_alloc_skb().
This ends up to page_frag_alloc() to allocate skb->data from
page_frag_cache->va.
During the memory pressure, page_frag_cache->va may be allocated as
pfmemalloc page. As a result, the skb->pfmemalloc is always true as
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