Glasgow beat defending champions Leinster 22-20 last Saturday but a second-half lapse saw the Irishmen take the lead with just five minutes left on the clock. A last-gasp penalty edged the Warriors back in front to take the win.
Peter told the Evening Times: "Leinster and Cardiff are two teams we lost to last year and we know we have to be at our best.
"In the first half at the weekend we were very good, but there was a 15-minute spell after the break where we weren't, so we had things to work on. We'll try and produce the 80-minute performance we are looking for against Cardiff.
"They are a really dangerous team with talented individuals, so we have been working hard this week.
"We won both our games in the league against them but lost our Heineken Cup games.
"We are aware of the talented players they have, but we know what we need to do to beat them.
"It's important to keep the momentum going. We have massive competition for places, the guys who get picked really have to perform.
"Winning is a habit, it just builds and builds. We want that to continue."