Date: Mon, 1 Aug 2016 04:51:31 +0000 (UTC) From: Sepherosa Ziehau <sephe@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r303604 - head/sys/dev/hyperv/storvsc Message-ID: <201608010451.u714pVxZ018152@repo.freebsd.org>
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Author: sephe Date: Mon Aug 1 04:51:31 2016 New Revision: 303604 URL: https://svnweb.freebsd.org/changeset/base/303604 Log: hyperv/storvsc: Set maxio to 128KB. MFC after: 1 week Sponsored by: Microsoft Differential Revision: https://reviews.freebsd.org/D7360 Modified: head/sys/dev/hyperv/storvsc/hv_storvsc_drv_freebsd.c Modified: head/sys/dev/hyperv/storvsc/hv_storvsc_drv_freebsd.c ============================================================================== --- head/sys/dev/hyperv/storvsc/hv_storvsc_drv_freebsd.c Mon Aug 1 04:26:24 2016 (r303603) +++ head/sys/dev/hyperv/storvsc/hv_storvsc_drv_freebsd.c Mon Aug 1 04:51:31 2016 (r303604) @@ -88,10 +88,25 @@ __FBSDID("$FreeBSD$"); #define VSTOR_PKT_SIZE (sizeof(struct vstor_packet) - vmscsi_size_delta) -#define STORVSC_DATA_SEGCNT_MAX 32 +/* + * 33 segments are needed to allow 128KB maxio, in case the data + * in the first page is _not_ PAGE_SIZE aligned, e.g. + * + * |<----------- 128KB ----------->| + * | | + * 0 2K 4K 8K 16K 124K 128K 130K + * | | | | | | | | + * +--+--+-----+-----+.......+-----+--+--+ + * | | | | | | | | | DATA + * | | | | | | | | | + * +--+--+-----+-----+.......------+--+--+ + * | | | | + * | 1| 31 | 1| ...... # of segments + */ +#define STORVSC_DATA_SEGCNT_MAX 33 #define STORVSC_DATA_SEGSZ_MAX PAGE_SIZE #define STORVSC_DATA_SIZE_MAX \ - (STORVSC_DATA_SEGCNT_MAX * STORVSC_DATA_SEGSZ_MAX) + ((STORVSC_DATA_SEGCNT_MAX - 1) * STORVSC_DATA_SEGSZ_MAX) struct storvsc_softc; @@ -1386,6 +1401,7 @@ storvsc_action(struct cam_sim *sim, unio cpi->hba_misc = PIM_NOBUSRESET; if (hv_storvsc_use_pim_unmapped) cpi->hba_misc |= PIM_UNMAPPED; + cpi->maxio = STORVSC_DATA_SIZE_MAX; cpi->hba_eng_cnt = 0; cpi->max_target = STORVSC_MAX_TARGETS; cpi->max_lun = sc->hs_drv_props->drv_max_luns_per_target;
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