Re: [gem5-users] Writeback buffer kills O3 performance, what is it meant to model?

2014-05-12 Thread Paul V. Gratz via gem5-users
which would be a good thing if in fact everyone else is either suffering >> unaware or just working around it by setting a large value for wbDepth. >> >> That said, we've done some internal performance correlation work, and I >> don't recall this being an issue,

[gem5-users] Writeback buffer kills O3 performance, what is it meant to model?

2014-05-09 Thread Paul V. Gratz via gem5-users
Hi All, Doing some digging on performance issues in the O3 model we and others have run into allocation of the writeback buffer having a big performance impact. Basically, the a writeback buffer is grabbed at issue time and held through till completion. With default assumptions about the number o