On Sun, 2012-12-02 at 21:25 +0800, Ling Ma wrote:
> Hi Eric,
>
> Attached benchmark test-cwf.c(cc -o test-cwf test-cwf.c), the result
> shows when last level cache(LLC) miss and CPU fetches data from
> memory, critical word as first 64bit member in cache line has better
> performance(costs
Hi Eric,
Attached benchmark test-cwf.c(cc -o test-cwf test-cwf.c), the result
shows when last level cache(LLC) miss and CPU fetches data from
memory, critical word as first 64bit member in cache line has better
performance(costs 158290336 cycles ) than other positions(offset 0x10,
costs 164100732
Hi Eric,
Attached benchmark test-cwf.c(cc -o test-cwf test-cwf.c), the result
shows when last level cache(LLC) miss and CPU fetches data from
memory, critical word as first 64bit member in cache line has better
performance(costs 158290336 cycles ) than other positions(offset 0x10,
costs 164100732
On Sun, 2012-12-02 at 21:25 +0800, Ling Ma wrote:
Hi Eric,
Attached benchmark test-cwf.c(cc -o test-cwf test-cwf.c), the result
shows when last level cache(LLC) miss and CPU fetches data from
memory, critical word as first 64bit member in cache line has better
performance(costs 158290336
On Tue, 2012-11-27 at 21:48 +0800, Ling Ma wrote:
> Ling: in the looking-up routine, hash value is the most important key,
> if it is matched, the other values have most possibility to be
> satisfied, and CFW is limited by memory bandwidth(64bit usually), so
> we only move hash value as critical
> networking patches should be sent to netdev.
>
> (I understand this patch is more a generic one, but at least CC netdev)
Ling: OK, this is my first inet patch, I will send to netdev later.
> You give no performance numbers for this change...
Ling: after I get machine, I will send out test
networking patches should be sent to netdev.
(I understand this patch is more a generic one, but at least CC netdev)
Ling: OK, this is my first inet patch, I will send to netdev later.
You give no performance numbers for this change...
Ling: after I get machine, I will send out test result.
On Tue, 2012-11-27 at 21:48 +0800, Ling Ma wrote:
Ling: in the looking-up routine, hash value is the most important key,
if it is matched, the other values have most possibility to be
satisfied, and CFW is limited by memory bandwidth(64bit usually), so
we only move hash value as critical
On Sun, 2012-11-25 at 22:44 -0800, Eric Dumazet wrote:
> On Mon, 2012-11-26 at 11:29 +0800, ling.ma.prog...@gmail.com wrote:
> > From: Ma Ling
> >
> > In order to reduce memory latency when last level cache miss occurs,
> > modern CPUs i.e. x86 and arm introduced Critical Word First(CWF) or
> >
On Sun, 2012-11-25 at 22:44 -0800, Eric Dumazet wrote:
On Mon, 2012-11-26 at 11:29 +0800, ling.ma.prog...@gmail.com wrote:
From: Ma Ling ling.ma.prog...@gmail.com
In order to reduce memory latency when last level cache miss occurs,
modern CPUs i.e. x86 and arm introduced Critical Word
On Mon, 2012-11-26 at 11:29 +0800, ling.ma.prog...@gmail.com wrote:
> From: Ma Ling
>
> In order to reduce memory latency when last level cache miss occurs,
> modern CPUs i.e. x86 and arm introduced Critical Word First(CWF) or
> Early Restart(ER) to get data ASAP. For CWF if critical word is
From: Ma Ling
In order to reduce memory latency when last level cache miss occurs,
modern CPUs i.e. x86 and arm introduced Critical Word First(CWF) or
Early Restart(ER) to get data ASAP. For CWF if critical word is first member
in cache line, memory feed CPU with critical word, then fill others
From: Ma Ling ling.ma.prog...@gmail.com
In order to reduce memory latency when last level cache miss occurs,
modern CPUs i.e. x86 and arm introduced Critical Word First(CWF) or
Early Restart(ER) to get data ASAP. For CWF if critical word is first member
in cache line, memory feed CPU with
On Mon, 2012-11-26 at 11:29 +0800, ling.ma.prog...@gmail.com wrote:
From: Ma Ling ling.ma.prog...@gmail.com
In order to reduce memory latency when last level cache miss occurs,
modern CPUs i.e. x86 and arm introduced Critical Word First(CWF) or
Early Restart(ER) to get data ASAP. For CWF if
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