On 02/15/2013 09:20 PM, Ric Mason wrote: > On 02/14/2013 02:38 AM, Seth Jennings wrote: <snip> >> >> Some addition performance metrics regarding the performance >> improvements and I/O reductions that can be achieved using zswap as >> measured by SPECjbb are provided here: >> >> http://ibm.co/VCgHvM > > I see this link. You mentioned that "When a user enables zswap and > the hardware accelerator, zswap simply passes the pages to be > compressed or decompressed off to the accelerator instead of > performing the work in software". Then how can user enable hardware > accelerator, there are option in UEFI or ... ?
zswap uses the cryptographic API for accessing compressor modules. In the case of Power7+, we have a crypto API driver (crypto/842.c) which wraps calls to the real driver (drivers/crypto/nx/nx-842.c) which makes the hardware calls. To use a compressor module, use the zswap.compressor attribute on the kernel parameter. For P7+, for exmaple: zswap.compressor=842 > >> These results include runs on x86 and new results on Power7+ with >> hardware compression acceleration. Thanks, Seth -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
