On 12/13/2018 06:03 AM, Eric Dumazet wrote:
>
>
> On 12/13/2018 05:33 AM, Marek Majkowski wrote:
>> Ok, 4.19 does seem to kinda fix the SO_RCVLOWAT with splice, but I
>> don't fully understand it:
>>
>> fcntl(8, F_SETPIPE_SZ, 1048576) = 1048576 <0.33>
>> setsockopt(4, SOL_SOCKET, S
On Thu, Dec 13, 2018 at 02:17:20PM +0100, Marek Majkowski wrote:
> > splice code will be expensive if less than 1MB is present in receive queue.
>
> I'm not sure what you are suggesting. I'm just shuffling data between
> two sockets. Is there a better buffer size value? Is it possible to
> keep sp
On 12/13/2018 05:33 AM, Marek Majkowski wrote:
> Ok, 4.19 does seem to kinda fix the SO_RCVLOWAT with splice, but I
> don't fully understand it:
>
> fcntl(8, F_SETPIPE_SZ, 1048576) = 1048576 <0.33>
> setsockopt(4, SOL_SOCKET, SO_RCVLOWAT, [131072], 4) = 0 <0.14>
> splice(4, NULL
Hi Eric!
On Thu, Dec 13, 2018 at 05:37:11AM -0800, Eric Dumazet wrote:
> Maybe mlx5 driver is in LRO mode, packing TCP payload in 4K pages ?
I could be wrong but I don't think so : I remember having been used to
LRO on myri10ge a decade ago giving me good performance which would
degrade with conc
On 12/13/2018 04:55 AM, Willy Tarreau wrote:
>
> It's quite strange, it doesn't match at all what I'm used to. In haproxy
> we're using splicing as well between sockets, and for medium to large
> objects we always get much better performance with splicing than without.
> 3 years ago during a t
Ok, 4.19 does seem to kinda fix the SO_RCVLOWAT with splice, but I
don't fully understand it:
fcntl(8, F_SETPIPE_SZ, 1048576) = 1048576 <0.33>
setsockopt(4, SOL_SOCKET, SO_RCVLOWAT, [131072], 4) = 0 <0.14>
splice(4, NULL, 9, NULL, 1048576, SPLICE_F_MOVE) = 121435 <71.039385>
splice
On Thu, Dec 13, 2018 at 2:17 PM Marek Majkowski wrote:
>
> Eric,
>
> On Thu, Dec 13, 2018 at 1:49 PM Eric Dumazet wrote:
> > On 12/13/2018 03:25 AM, Marek Majkowski wrote:
> > > Hi!
> > >
> > > I'm basically trying to do TCP splicing in Linux. I'm focusing on
> > > performance of the simplest cas
Eric,
On Thu, Dec 13, 2018 at 1:49 PM Eric Dumazet wrote:
> On 12/13/2018 03:25 AM, Marek Majkowski wrote:
> > Hi!
> >
> > I'm basically trying to do TCP splicing in Linux. I'm focusing on
> > performance of the simplest case: receive data from one TCP socket,
> > write data to another TCP socket
Hi Marek,
On Thu, Dec 13, 2018 at 12:25:20PM +0100, Marek Majkowski wrote:
> Hi!
>
> I'm basically trying to do TCP splicing in Linux. I'm focusing on
> performance of the simplest case: receive data from one TCP socket,
> write data to another TCP socket. I get poor performance with splice.
>
>
On 12/13/2018 03:25 AM, Marek Majkowski wrote:
> Hi!
>
> I'm basically trying to do TCP splicing in Linux. I'm focusing on
> performance of the simplest case: receive data from one TCP socket,
> write data to another TCP socket. I get poor performance with splice.
>
> First, the naive code, pr
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