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We study supersymmetric vacua of the N=1 cascading SU(M+p)xSU(p) gauge theorywith flavor - the theory on p D3-branes and M wrapped D5-branes at the tip ofthe conifold, and N_f flavor D7-branes wrapping a holomorphic four-cycle insidethe conifold. The Coulomb branch of the moduli space is inherited from the puregauge theory without flavor and was thoroughly studied in the past. Besides,there is a Higgs branch where some D3 and/or D5-branes dissolve in theD7-branes forming the worldvolume gauge instantons. We study the Higgs branchboth from the field theory and the bulk point of view. On the classical levelthe moduli space is closely related to the one of the N=2 C^2/Z_2 orbifoldtheory, in particular certain vacua of the N=1 theory are related tononcommutative instantons on the resolved C^2/Z_2. On the quantum level theHiggs branch acquires corrections due to renormalization of the Kahlerpotential and non-perturbative effects in field theory. In the bulk this isencoded in the classical D7-brane geometry. We compute the VEVs of theprotected operators and the field theory RG flow and find an agreement with theparallel computations in the bulk.

Comments on the N=1 SU(M+p)xSU(p) quiver gauge theory with flavor