Dear Omar and Andreas,
Yes you are right. I changed the --mem-type to DDR3_1600_x64 and the
problem was solved. The value for IDDs in DRAMCtrl.py are set to:
for DDR3_1600_x64
IDD0 = '75mA' and IDD3N = '57mA'
for DDR4_2400_x64,
IDD0 = '64mA' and IDD3N = '67mA'
It seems that IDDs for DDR4_2400_x64 need to be revised.
Regards
On Wed, Mar 11, 2015 at 9:20 PM, omar naji <[email protected]> wrote:
> Hi Majid,
>
> The problem is that the IDD0 value is smaller than the active background
> current IDD3n as defined in the used datasheet. This leads to a negative
> value in the activation energy. I suppose this is a bug in the used DDR4
> datasheet. I would propose that you set the latency and current
> parameters of DDR4 using another datasheet.
>
> Regards,
> Omar
>
> > Date: Wed, 11 Mar 2015 15:37:25 +0000
> > From: [email protected]
> > To: [email protected]; [email protected]
> > Subject: Re: [gem5-users] Negative value for system.mem_ctrls_1.actEnergy
>
> >
> > Hi Majid,
> >
> > First I would suggest to check the IDD values. Perhaps there is a typo
> somewhere, or even an inconsistency in the actual data sheet.
> >
> > Second it would be good to know if you're doing any form of check
> pointing. If so there could be something not getting reset properly.
> >
> > Andreas
> >
> > -----
> > On Mar 11, 2015 at 12:44 PM, Majid Jalili <[email protected]> wrote:
> >
> >
> > Dears,
> >
> > I run most recent version of gem5 without any modification to source code
> > and with following command in SE mode:
> >
> > ./build/ALPHA/gem5.opt ./configs/example/cmp.py -b
> > lbm,lbm,lbm,lbm,lbm,lbm,lbm,lbm --mem-type=DDR4_2400_x64 --mem-size=16GB
> -n
> > 8 --caches --l2cache --cpu-type=detailed --l2_size=4MB
> --cacheline_size=64
> > --l1i_size=64kB --l1d_size=64kB -I 1000000
> >
> > then in the stat file I see weired result for activation energy:
> > system.mem_ctrls_1.actEnergy -1076645.169600
> > # Energy for activate commands per rank (pJ)
> >
> > I am wondering if someone could help me with this problem.
> >
> >
> > Regards
> > Majid
> >
> > _______________________________________________
> > gem5-users mailing list
> > [email protected]
> > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
>
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