On Sun, Aug 19, 2007 at 05:47:59PM -0700, Felix Marti ([EMAIL PROTECTED]) wrote:
[Felix Marti] David and Herbert, so you agree that the userkernel
space memory copy overhead is a significant overhead and we want to
enable zero-copy in both the receive and transmit path? - Yes, copy
It depends.
Felix Marti [EMAIL PROTECTED] writes:
avoidance gains of TSO and LRO are still a very worthwhile savings.
So, i.e. with TSO, your saving about 16 headers (let us say 14 + 20 +
20), 864B, when moving ~64KB of payload - looks like very much in the
noise to me.
TSO is beneficial for the
PROTECTED]
Subject: Re: [ofa-general] Re: [PATCH RFC] RDMA/CMA: Allocate
PS_TCPportsfrom the host TCP port space.
Felix Marti [EMAIL PROTECTED] writes:
avoidance gains of TSO and LRO are still a very worthwhile
savings.
So, i.e. with TSO, your saving about 16 headers (let us say 14 + 20
: [ofa-general] Re: [PATCH RFC] RDMA/CMA: Allocate
PS_TCPportsfrom the host TCP port space.
On Sun, Aug 19, 2007 at 05:47:59PM -0700, Felix Marti
([EMAIL PROTECTED]) wrote:
[Felix Marti] David and Herbert, so you agree that the userkernel
space memory copy overhead is a significant overhead
Felix Marti [EMAIL PROTECTED] writes:
What I was referring to is that TSO(/LRO) have their own
issues, some eluded to by Roland and me. In fact, customers working on
the LSR couldn't use TSO due to the burstiness it introduces
That was in old kernels where TSO didn't honor the initial cwnd
Miller
Subject: Re: [ofa-general] Re: [PATCH RFC] RDMA/CMA: Allocate
PS_TCPportsfrom the host TCP port space.
Felix Marti [EMAIL PROTECTED] writes:
What I was referring to is that TSO(/LRO) have their own
issues, some eluded to by Roland and me. In fact, customers working
on
the LSR
Andi Kleen wrote:
TSO is beneficial for the software again. The linux code currently
takes several locks and does quite a few function calls for each
packet and using larger packets lowers this overhead. At least with
10GbE saving CPU cycles is still quite important.
Some quick netperf
* Felix Marti [EMAIL PROTECTED] 2007-08-20 12:02
These graphic adapters provide a wealth of features that you can take
advantage of to bring these amazing graphics to life. General purpose
CPUs cannot keep up. Chelsio offload devices do the same thing in the
realm of networking. - Will there
GPUs have almost no influence on system security,
Unless you use direct rendering from user space.
-Andi
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Felix Marti wrote:
Yes, the app will take the cache hits when accessing the data. However,
the fact remains that if there is a copy in the receive path, you
require and additional 3x memory BW (which is very significant at these
high rates and most likely the bottleneck for most current
]
Subject: Re: [ofa-general] Re: [PATCH RFC] RDMA/CMA: Allocate
PS_TCPportsfrom the host TCP port space.
Felix Marti wrote:
Yes, the app will take the cache hits when accessing the data.
However,
the fact remains that if there is a copy in the receive path, you
require and additional 3x memory
: [ofa-general] Re: [PATCH RFC] RDMA/CMA: Allocate
PS_TCPportsfrom the host TCP port space.
From: Sean Hefty [EMAIL PROTECTED]
Date: Sun, 19 Aug 2007 00:01:07 -0700
Millions of Infiniband ports are in operation today. Over 25% of
the
top 500
supercomputers use Infiniband. The formation
From: Felix Marti [EMAIL PROTECTED]
Date: Sun, 19 Aug 2007 10:33:31 -0700
I know that you don't agree that TSO has drawbacks, as outlined by
Roland, but its history showing something else: the addition of TSO
took a fair amount of time and network performance was erratic for
multiple kernel
RFC] RDMA/CMA: Allocate
PS_TCPportsfrom the host TCP port space.
From: Felix Marti [EMAIL PROTECTED]
Date: Sun, 19 Aug 2007 10:33:31 -0700
I know that you don't agree that TSO has drawbacks, as outlined by
Roland, but its history showing something else: the addition of TSO
took a fair
Felix Marti [EMAIL PROTECTED] writes:
what benefits does the TSO infrastructure give the
non-TSO capable devices?
It improves performance on software queueing devices between guests
and hypervisors. This is a more and more important application these
days. Even when the system running the
From: Felix Marti [EMAIL PROTECTED]
Date: Sun, 19 Aug 2007 12:49:05 -0700
You're not at all addressing the fact that RDMA does solve the
memory BW problem and stateless offload doesn't.
It does, I just didn't retort to your claims because they were
so blatantly wrong.
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To unsubscribe from
From: Andi Kleen [EMAIL PROTECTED]
Date: 20 Aug 2007 01:27:35 +0200
Felix Marti [EMAIL PROTECTED] writes:
what benefits does the TSO infrastructure give the
non-TSO capable devices?
It improves performance on software queueing devices between guests
and hypervisors. This is a more and
Felix Marti [EMAIL PROTECTED] wrote:
[Felix Marti] Aren't you confusing memory and bus BW here? - RDMA
enables DMA from/to application buffers removing the user-to-kernel/
kernel-to-user memory copy with is a significant overhead at the
rates we're talking about: memory copy at 20Gbps
RFC] RDMA/CMA: Allocate
PS_TCPportsfrom the host TCP port space.
From: Felix Marti [EMAIL PROTECTED]
Date: Sun, 19 Aug 2007 12:49:05 -0700
You're not at all addressing the fact that RDMA does solve the
memory BW problem and stateless offload doesn't.
It does, I just didn't retort to your
From: Felix Marti [EMAIL PROTECTED]
Date: Sun, 19 Aug 2007 17:32:39 -0700
[ Why do you put that [Felix Marti] everywhere you say something?
It's annoying and superfluous. The quoting done by your mail client
makes clear who is saying what. ]
Hmmm, interesting... I guess it is impossible to
RFC] RDMA/CMA: Allocate
PS_TCPportsfrom the host TCP port space.
From: Felix Marti [EMAIL PROTECTED]
Date: Sun, 19 Aug 2007 17:32:39 -0700
[ Why do you put that [Felix Marti] everywhere you say something?
It's annoying and superfluous. The quoting done by your mail client
makes clear who
From: Felix Marti [EMAIL PROTECTED]
Date: Sun, 19 Aug 2007 17:47:59 -0700
[Felix Marti]
Please stop using this to start your replies, thank you.
David and Herbert, so you agree that the userkernel
space memory copy overhead is a significant overhead and we want to
enable zero-copy in both
RFC] RDMA/CMA: Allocate
PS_TCPportsfrom the host TCP port space.
From: Felix Marti [EMAIL PROTECTED]
Date: Sun, 19 Aug 2007 17:47:59 -0700
[Felix Marti]
Please stop using this to start your replies, thank you.
Better?
David and Herbert, so you agree that the userkernel
space memory
: [ofa-general] Re: [PATCH RFC] RDMA/CMA: Allocate
PS_TCPportsfrom the host TCP port space.
Felix Marti [EMAIL PROTECTED] writes:
what benefits does the TSO infrastructure give the
non-TSO capable devices?
It improves performance on software queueing devices between guests
and hypervisors
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