Date: Sat, 17 Mar 2018 20:06:04 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-arm@FreeBSD.org Subject: [Bug 226682] ARMADA38X: Running out of CESA TDMA descriptors for disk I/O on GELI SSD Message-ID: <bug-226682-7@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D226682 Bug ID: 226682 Summary: ARMADA38X: Running out of CESA TDMA descriptors for disk I/O on GELI SSD Product: Base System Version: CURRENT Hardware: arm OS: Any Status: New Severity: Affects Some People Priority: --- Component: arm Assignee: freebsd-arm@FreeBSD.org Reporter: chris@mumac.de While testing I/O performance on a SolidRun Clearfog Pro (ARMADA A38x) with= an SSD (PLEXTOR PX-128M6G-2242) encrypted by GELI AES-CBC, errors were reporte= d on the console/dmesg about running out of TMDA descriptors. Looking at sys/dev/cesa/cesa.h, the comments seem to focus on network buffe= rs with a maximum size of 1500 bytes while SSD disk I/O in my case would invol= ve 4KB buffers. Without really diving into the rest of the code, I've increased the values in cesa.h and can now operate the SSD with sustained rates ~200M= B/s without running out of TDMA descriptors. There might be better ways to do this but the "diff" below most certainly f= ixed my issue. Index: sys/dev/cesa/cesa.h =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D --- sys/dev/cesa/cesa.h (revision 329554) +++ sys/dev/cesa/cesa.h (working copy) @@ -63,8 +63,8 @@ */ /* Values below are optimized for requests containing about 1.5 kB of data= */ -#define CESA_SA_DESC_PER_REQ 2 -#define CESA_TDMA_DESC_PER_REQ 8 +#define CESA_SA_DESC_PER_REQ (2 * 3) /* 4KB, not 1.5kB */ +#define CESA_TDMA_DESC_PER_REQ (8 * 3) /* 4KB, not 1.5kB */ #define CESA_SA_DESCRIPTORS (CESA_SA_DESC_PER_REQ * CESA_REQUES= TS) #define CESA_TDMA_DESCRIPTORS (CESA_TDMA_DESC_PER_REQ * CESA_REQUESTS) --=20 You are receiving this mail because: You are the assignee for the bug.=
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